Brian Johnson (? - 1987) is a character in the Grand Theft Auto series who is mentioned in Grand Theft Auto: San Andreas. Brian is the son of Beverly Johnson and the youngest brother of Carl, Sean ("Sweet") and Kendl Johnson.
Brian was associated with the Grove Street Families, likely due to being a relative of the gang's leader, his older brother Sweet. He lived in the Johnson House, Ganton, Los Santos until his death in 1987. He apparently bore a strong resemblance to Carl, as Emmet initially mistakes Carl for Brian when they first meet.
It is implied that Brian Johnson died in a tragic accident in 1987, with his brother Carl present at the time of his death. Sweet blamed Carl for his death, which led to Carl leaving Los Santos for Liberty City. Carl did not attend Brian's funeral, confirmed when Sweet says: "That's another funeral you ran away from, fool. Just like Brian's." It is implied that either the accident was so severe that Carl was lucky to have survived, or Sweet attempted to kill Carl in revenge for Brian's death, as Sweet says to Big Smoke in The Introduction "CJ's been spending 5 years running around like a fool on the east coast when he should've been dead."
According to what Tenpenny says to Carl in the end cutscene of The Green Sabre, and later what Carl says to Sweet during End of the Line while they're outside Smoke's drug palace, Carl let Brian die in some way, however it is never made clear how.