This guy bears a strong resemblance to Steven Michael Clark Jr.
There is no mention of a tattoo on his arm or the scars described on the UID, but the Distinguishing Characteristics info in Charley Project is very brief, and they could have neglected to mention it. His friend Burt Dollar (http://www.charleyproject.org/cases/d/dollar_burt.html) had tattoos, which were described.
He is the right height, and he has blue eyes to match the UID. His hair is short enough in some of his four photos, but the drawing of the UID depicts him with his hair parted on the left, whereas the B&W photo of SMC shows him with his hair parted on his right. People don't usually alternate the side at which they part their hair.
The combat boots and camouflage pants on the UID suggest a similar personality type to what the bandanna and the backwards baseball cap suggest for SMC.
The circumstances don't fit real well. There is a one-month lag between DLC's for Clark and Dollar and this UID's death, so it is difficult to concoct a scenario to fit these circumstances. He disappeared from Long Beach CA with his friend, Burt Dollar, and the car was found about 300 miles North near Yosemite Natl. Park. San Diego is the opposite direction. Perhaps it is possible that they drove South to San Diego, where one or both of them were murdered, and the perp drove their car to Yosemite. There is no mention of when the car was found, and one would still have to explain what they were doing for a month before this UID was murdered.