The rapper, who's real name is Christopher Dooley, Jr., was arrested and booked for second-degree murder after cops say he shot and killed a man early Friday morning at a Texaco gas station in Shreveport, Louisiana ... according to the Shreveport PD.

Cops say Chris initially told them there was an alleged struggle over his car, so he shot the man multiple times in self-defense. But, cops say surveillance footage painted a much different picture ... resulting in Chris' arrest for second-degree murder.

What's more ... cops say the car Chris was riding in was actually reported stolen out of Texas, which resulted in the rapper also getting booked for illegal possession of stolen things.