PNB ROCK’s Murder suspect has been identified by police!

LAPD is naming a suspect in the murder of PnB Rock ... he's still on the loose, and should be considered "armed and dangerous."

Cops announced Wednesday morning, Freddie Lee Trone, is the guy detectives have fingered as "a person involved" in the Sept. 12 slaying of the rapper as he sat in a Roscoe's Chicken & Waffles.

8:18 AM PT -- Law enforcement sources say the 17-year-old son of Freddie Trone has been arrested in connection to the shooting. We're told the son was the shooter, and Freddie drove the getaway car.

Our sources also say the father and son duo were already in the restaurant's parking lot when PnB arrived, seemingly removing the possibility that PnB was targeted from a social media post from his GF showing they were eating at Roscoe's. We're told after the murder, the suspects burned the getaway vehicle.