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

We spoke with Paul … who tells us his longtime good friend 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 good friend a spot to remain, and — this morning — he left round 6 AM to go work on a film. He referred to 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 referred to as his girlfriend, who went to test on him … and located him in mattress, turned utterly blue.

Paul says Donald’s GF and her good friend referred to as 911, and so they tried to carry out CPR on him with the assistance of the operator … however, he was already lifeless.

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 could have performed a job in his loss of life.

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

We’re informed there is no such thing as a foul play or medication suspected … and, this seems to be a pure loss of life.

Paul himself has had a protracted profession within the movie business … showing in large initiatives like Clint Eastwood‘s “Blood Work,” “The Golden Women,” “The Twilight Zone,” “Sandy Wexler,” “Clifford the Huge Pink 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.