Phoenix

Scottsdale Police Seek Public's Help in Locating Suspect Matthew Dieringer in Connection with Targeted Homicide

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Published on September 05, 2025
Scottsdale Police Seek Public's Help in Locating Suspect Matthew Dieringer in Connection with Targeted HomicideSource: Facebook/Scottsdale Police Department

Scottsdale police are in pursuit of 35-year-old Matthew Dieringer, wanted in connection to a purportedly deliberate homicide that transpired in Scottsdale. Frank Quaranta, 67, did not appear for work, initiating concern and a subsequent welfare check at his home near 68th Street and McDowell Road on Sept. 1, leading to the discovery of Quaranta's demise. Authorities have since conducted a thorough investigation at the residence seeking evidence, as reported yesterday, September 4 by FOX 10 Phoenix.

Dieringer, the suspect, has a blond hair and blue eyes, stands at 6 feet, 3 inches tall, and reportedly has a history of homelessness. Described as "manipulative and charismatic," he is known to exploit these traits to find lodging from those he befriends. The Scottsdale Police Department has issued a warning, indicating that Dieringer should not be approached and that individuals should instead call 911 upon sighting him. Adding to his description, they noted he's 185 pounds, as per a statement released by 12 News.

The city's law enforcement has requested that anyone with information about Dieringer's whereabouts contact them at (480) 312-TIPS or Silent Witness at (480) 948-6377, in an effort to expedite his apprehension. Silent Witness offers a safeguard of anonymity to tipsters, and those whose information leads to an arrest or indictment in this case might be eligible for a cash reward of up to $1,000. Discussing the program, Silent Witness allows the community to provide intelligence on felonies through TV, radio, social media, and its app or website, ensuring tip anonymity and available live operators to field calls 24/7.

Scottsdale PD remains tight-lipped about the specifics of the evidence collected from Quaranta's home, but the nature of the crime has been vehemently described as a targeted attack. They continue to gather and analyze forensic data, in addition to canvassing for witnesses that they discovered Quaranta, deceased. Community cooperation and vigilance are critical in these cases, as underscored by the ongoing investigation into Dieringer's whereabouts. Police have stressed in their messaging to the public that any sightings or encounters with Dieringer should be relayed immediately to 911, while refraining from direct engagement with the suspect.