Actor-comedian Paul Rodriguez‘s greatest buddy died in his L.A.-area residence Thursday … and cops are saying the loss of life seems pure, with nothing nefarious suspected at this level.

We spoke with Paul … who tells us his longtime buddy Donald Serrato had simply bought his home in Torrance and was shifting to Montana — however, earlier than he moved, he wanted a spot to remain for just a few days.

PR gave his buddy a spot to remain, and — this morning — he left round 6 AM to go work on a film. He known as Serrato round midday to see if he wished to seize lunch, however acquired no response.

Since he could not get in contact with Donald, Paul known as his girlfriend, who went to examine on him … and located him in mattress, turned fully blue.

Paul says Donald’s GF and her buddy known as 911, they usually tried to carry out CPR on him with the assistance of the operator … however, he was already useless.

Rodriguez says Serrato was a heavy drinker and smoker who was coping with the lack of a pair members of the family … all of which, Rodriguez believes might have performed a task in his loss of life.

Regulation enforcement sources affirm … they responded to a name a few man not respiratory simply after 12:30 PM, arriving at Rodriguez’s residence shortly after. Serrato was pronounced useless on the scene.

We’re informed there isn’t any foul play or medicine suspected … and, this seems to be a pure loss of life.

Paul himself has had a protracted profession within the movie trade … showing in large initiatives like Clint Eastwood‘s “Blood Work,” “The Golden Ladies,” “The Twilight Zone,” “Sandy Wexler,” “Clifford the Massive Purple Canine,” “King of the Hill,” “Grand Slam” and extra. Maybe his most credit score — he is the daddy of famed skateboarder Paul “P-Rod” Rodriguez Jr.

Serrato was 50.