The brother of slain boxer Isiah Jones has been arrested and charged with murder ... after prosecutors say he shot and killed the fighter following a dispute earlier this week.
According to officials, Timothy Lyman is accused of getting into an argument with Jones at around 6:20 p.m. on Monday in Detroit ... before shooting him in the face and fleeing the area.
Authorities say Jones was found unresponsive at the scene and was later pronounced dead.
Lyman was arrested on Wednesday -- and, according to prosecutors, he's now been charged with one count of second-degree murder, and one count of felony firearm.