He was identified as Oscar Fuentes, 20 yo. Unfortunately, his death was a homicide (gunshot wound to the head) by MS-13, because Fuentes "abandoned MS-13 and was addicted to methamphetamine".

His death was one among other brutal murders perpetrated by some members of the gang, and they have been charged and convicted for some of them. They will be sentenced in July 2026.
Members of the MS-13 gang used the Angeles National Forest and other isolated mountain areas as the locale for a series of grisly killings, prosecutors argued at a racketeering trial in downtown Los Angeles.
www.latimes.com
[...]
Oscar Fuentes, a skinny 19-year-old member of MS-13, had broken two rules, Siddall said: He’d gotten strung out on methamphetamine and he was missing clique meetings.
On Jan. 13, 2019, Fuentes was spotted at Whitsett Park, the heart of the Fulton clique’s territory. Martinez sent a Facebook message to the juvenile with whom he’d allegedly killed Hernandez a month earlier.
“You have a little present here,” Martinez wrote.
After the juvenile didn’t respond, Martinez, Chavez and two others picked up Fuentes from the park and drove him to a remote area near Santa Clarita, Siddall said. Chavez handed a revolver to a prospect who shot Fuentes in the head, according to the prosecutor.
A federal jury Monday convicted five members of MS-13, or Mara Salvatrucha, for their role in a string of murders, including a man whose body was found in the Angeles […]
signalscv.com
[...]
Fuentes’ skeleton was found Oct. 26, 2019, by a public works employee who had come across it while surveying the area scarred by the Tick Fire, which broke out a few days earlier.
Investigators said at the time that the bodily remains were in an “odd place for … somebody to just walk up there and die.”