The Pima County Sheriff’s Department is facing renewed attention after deputies responded to a report of human remains in a desert area near Tucson on August 17, while investigators continue work on several major criminal cases across Southern Arizona.
The latest development involves remains discovered near West Ajo Way and South La Cholla Boulevard. Search and rescue deputies responded to the location after receiving a report. Investigators said there was no indication at the time that the remains were connected to the disappearance of Nancy Guthrie.
The remains appeared to have been at the location for an extended period. That distinction is important because the discovery occurred as the department continues its high-profile investigation into Guthrie, an 84-year-old Tucson-area woman who disappeared earlier this year.
The department remains responsible for law enforcement and public safety across Pima County. Its current workload includes major investigations, detention operations, search-and-rescue responses, missing-person cases and community safety initiatives.
Latest human-remains discovery near Tucson
The newest development came Monday, August 17, when search-and-rescue personnel responded to reports of human remains in a desert area southwest of Tucson.
The location was approximately 15 miles from Nancy Guthrie’s home. Investigators quickly addressed speculation surrounding the discovery and stated that they had found no indication connecting the remains to the Guthrie investigation.
Officials also said the remains appeared to have been present at the location for a considerable period. That finding made the discovery a separate investigative matter rather than a confirmed development in the missing-person case.
The department’s response illustrates one of the responsibilities handled by its search-and-rescue personnel. Deputies routinely respond to remote areas throughout the county, where difficult terrain can complicate investigations and emergency operations.
Identification of unidentified remains can require additional forensic work. The medical examiner’s office may need to establish identity and other circumstances before investigators can determine whether the remains relate to a missing-person report or another case.
For now, authorities have not publicly established a connection between Monday’s discovery and Guthrie.
Nancy Guthrie investigation remains a major department priority
The disappearance of Nancy Guthrie continues to be one of the most closely watched investigations involving the department.
Guthrie disappeared from her Tucson-area home after being last seen on January 31. Investigators have treated the case as a suspected kidnapping and have worked with federal authorities during the search.
The investigation has generated surveillance footage, forensic evidence, public tips and communications that authorities have examined for possible leads.
In late July, the department released two ransom notes connected to the investigation. Officials sought public assistance in identifying the person who wrote the notes and encouraged anyone with useful information to contact investigators.
The release represented an effort to use information already in the case to generate new investigative leads. Investigators have also continued examining physical and digital evidence.
Forensic testing has not produced a public breakthrough that identifies a suspect. A hair sample recovered during the investigation also failed to provide a DNA match that could identify an abductor.
Authorities continue to encourage members of the public to report information that could help investigators. Even seemingly minor observations can become relevant when investigators compare them with other evidence.
The FBI remains involved in the case, providing federal investigative assistance rather than taking complete control of the investigation.
The case has also generated intense public scrutiny of the sheriff’s office and Sheriff Chris Nanos. Questions have centered on investigative decisions, evidence handling and the department’s response during the early stages of the disappearance.
Those issues remain matters of public debate, while the investigation itself continues.
Department faces scrutiny over leadership
Sheriff Chris Nanos remains in office and continues to lead the department.
Nanos was elected to another term in 2024 after defeating Republican challenger Heather Lappin by 495 votes following a recount. He previously served as sheriff and returned to the position in 2020.
The sheriff has faced significant criticism during 2026 because of the Guthrie investigation and other controversies involving department leadership.
A recall campaign was launched in March seeking to remove Nanos from office. Arizona law required organizers to collect more than 120,000 valid signatures within the statutory period.
The campaign did not reach the required threshold. The Pima County Elections Department confirmed that organizers failed to submit enough petition signatures by the July 10 deadline.
The unsuccessful recall effort means Nanos remains sheriff. The department has continued operating under his leadership.
The end of the recall campaign does not end scrutiny of the agency. Public attention remains focused on the Guthrie investigation, jail operations, officer conduct and other issues involving the department.
For residents, the key distinction is that criticism, lawsuits or political campaigns do not automatically establish wrongdoing. Individual allegations must be resolved through the appropriate legal or administrative process.
Recent homicide arrest involving infant death
Another major recent development involved the arrest of a Tucson-area man in connection with the death of his five-month-old child.
Detectives arrested 34-year-old Derrick J. Gonzales on August 14. He faces charges of first-degree murder and sexual abuse of a minor.
Investigators allege that the child’s death was presented as a drowning, while the investigation produced evidence supporting much more serious criminal allegations.
Gonzales appeared in court on August 15. A judge set his bond at $750,000.
He remained in the Pima County Adult Detention Complex as of August 17.
The charges are allegations, and Gonzales is presumed innocent unless proven guilty in court.
The case demonstrates the range of serious investigations handled by the department. Homicide detectives must coordinate crime-scene processing, forensic examination, interviews and evidence collection before prosecutors can pursue charges.
Because the investigation involves a child’s death, additional forensic work may also be necessary. Investigators and prosecutors will ultimately have to establish the circumstances surrounding the death and determine what evidence can be presented in court.
Cold-case work continues
The department has also demonstrated that older cases can receive new attention when modern forensic techniques produce previously unavailable leads.
One notable investigation involved William Reginald Sipfle, a 73-year-old man who disappeared in 1975.
Human remains discovered in connection with the case remained unidentified for decades. In 2025, investigators worked with a forensic genealogy company and used advanced DNA analysis to establish an identification.
The identification led detectives to Sipfle’s family and eventually to information that advanced the homicide investigation.
In May 2026, detectives arrested 79-year-old Carol Ann Beall on suspicion of first-degree murder in connection with Sipfle’s death.
The investigation did not stop with the arrest. Detectives later searched a property connected to Sipfle’s former residence and discovered additional human remains.
Investigators said the additional evidence appeared to be associated with the same case, although DNA testing was required for further identification.
The investigation demonstrates why unidentified-remains cases can remain active for decades. Advances in forensic genealogy and DNA analysis can provide investigative opportunities that were unavailable when evidence was originally collected.
The department’s homicide and cold-case investigators continue to examine evidence from older cases when new technology or information creates a viable path forward.
Public safety operations extend beyond major criminal cases
While major investigations attract the most attention, the department performs many other public safety functions throughout Pima County.
Its responsibilities include patrol services, criminal investigations, corrections, search and rescue, traffic enforcement, warrants and community programs.
The department also operates the Pima County Adult Detention Complex. Jail operations represent a substantial part of its public safety responsibilities.
Residents can use the department’s online resources for several services. These include inmate information, crime mapping, report requests and online reporting for certain minor incidents.
The department’s Desk Officer Reporting System allows eligible residents to submit reports for minor problems without necessarily visiting a sheriff’s facility.
Its community crime mapping system provides another way for residents to examine reported crime information.
These tools are intended to make routine interactions with law enforcement more accessible while allowing deputies to focus resources on emergencies and active investigations.
Search and rescue remains important in Pima County
Pima County’s geography creates unique challenges for emergency responders.
The region includes extensive desert areas, mountain terrain and remote locations. Search-and-rescue deputies can be called to assist people who become lost, injured or stranded.
The August 17 human-remains response illustrates the challenges associated with remote desert locations.
Search personnel must secure areas, document evidence and coordinate with investigators and forensic specialists. In some circumstances, difficult terrain can make evidence recovery more complicated than it would be in an urban environment.
The department also regularly warns residents and visitors about hazards associated with extreme heat and sudden flooding.
Southern Arizona’s monsoon season can create dangerous conditions in washes, canyons and normally dry waterways. Fast-moving water can become life-threatening within minutes.
The sheriff’s office has repeatedly urged people to avoid crossing flooded roads and waterways.
Those warnings are particularly important during periods of heavy rainfall, when conditions can change rapidly even if a road or bridge appears passable.
Department provides public contact and reporting services
For residents who need law enforcement assistance, the department maintains several contact options.
Emergency situations should be reported through 911.
The department lists its non-emergency number as 520-351-4900. The main headquarters is located at 1750 East Benson Highway in Tucson.
The department also operates a crime-tip line at 520-88-CRIME, or 520-882-7463.
Residents can use these channels to provide information about crimes, suspicious activity and ongoing investigations.
People who have information about the Nancy Guthrie investigation can also contact investigators through the channels established for that case.
The department’s website provides access to additional public services, including inmate lookup, report requests and crime-mapping resources.
These services remain important even when the agency is dealing with high-profile investigations.
What comes next for the department
The immediate focus remains on active investigations and routine public safety operations.
The Nancy Guthrie investigation continues without a publicly announced suspect or arrest. Investigators remain responsible for evaluating tips, forensic evidence, surveillance material and other information developed during the case.
The human remains discovered on August 17 are being treated separately because authorities have found no current indication that they relate to Guthrie’s disappearance.
The infant-death investigation also remains active as the criminal case moves through the court system.
At the same time, the department continues handling daily calls, jail operations, search-and-rescue missions and investigations across the county.
The failed recall campaign has also removed one immediate political threat to Nanos’ position, although the sheriff and department continue to face public scrutiny.
Residents should distinguish confirmed investigative developments from online speculation. Social media discussions can spread rapidly, but investigators must rely on evidence that can be verified and properly evaluated.
That distinction is especially important in missing-person and homicide investigations, where inaccurate information can interfere with witnesses, families and investigators.
What the latest update means for Pima County residents
The latest developments show that the department remains involved in several significant investigations at the same time.
The discovery of human remains near Tucson is currently not connected to the Nancy Guthrie case. The department has made that point clear while investigators continue working to establish the identity and circumstances surrounding the remains.
Guthrie’s disappearance remains unresolved. The release of ransom notes and continuing forensic work show that investigators are still pursuing leads, while the FBI continues assisting local authorities.
The August 14 arrest in the infant-death case represents another significant development, although the allegations will now proceed through the court system.
Cold-case investigators are also continuing to demonstrate how modern DNA technology can reopen investigations that remained unresolved for decades.
For Pima County residents, the department’s work therefore extends well beyond any single investigation. Deputies and investigators continue responding to emergencies, conducting criminal investigations, operating detention facilities and supporting search-and-rescue operations.
The coming weeks could bring additional developments in the Guthrie investigation, the infant-death prosecution, the unidentified-remains case or other investigations currently handled by the agency.
The latest developments keep the Pima County Sheriff’s Department under close public attention, and residents will be watching for verified updates as investigators continue their work.