Press release from the Arcata Police Department:

On August 29, 2023, at 6 a.m., Arcata Police Detectives, with the assistance of the Humboldt and Mendocino County Sheriff’s Department SWAT teams, served an arrest and search warrant for Arcata homicide suspect Gregory Nelson Mattox, in the 13000 block of Bald Hills Road Orick, CA.

Mattox was wanted for the July 2, 2023, killing of 36-year-old Joshua Gephart, in the 5000 block of Boyd Road in Arcata. Mattox was taken into custody without incident and was booked at the Humboldt County Correctional Facility on the following violations of the California Penal Code:

  • 187(a)-Murder
  • 29800(a)(1)-Felon in Possession of a Firearm
  • 1203.2-Violation of Probation
  • 148.9-Providing False Identity to a Peace Officer.

The Arcata Police Department would like to thank the Humboldt County Sheriff’s Department SWAT, Major Crimes Division, and Crisis Negotiation Team, as well as the Mendocino County Sherrif’s Departments SWAT, Arcata Mad River Ambulance, and Cal-Fire for their assistance.

Anyone with information about this investigation is encouraged to contact the APD Investigations Unit at 707-822-2424, or the anonymous tip line at 707-825-2588.  

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