Rapper Mo3 Was Chased, Ran for His Life Before Fatal Shooting

Rapper Mo3 was desperate to get away from his killers before he was gunned down on a Dallas freeway ... a chase that allegedly started the minute he'd left a friend's house.

Sources close to the situation tell TMZ ... the Dallas-based rapper left a female companion's house Wednesday morning and noticed he was being watched. It's unclear who the person tailing him was, but we're told they followed him in their vehicle from the home to a gas station.

Our sources say that's when Mo3 knew something was up, and jumped on I-35 in an attempt to lose the other vehicle. We're told he tried to get around traffic but ended up crashing on the side of the road.

That's when Mo3 got out of his car and ran for his life, before the trigger man gave chase and shot him in the back of the head. No one's been arrested for the deadly shooting, and police haven't identified a suspect yet.

TMZ broke the story ... Mo3 was shot and killed in his hometown where an innocent bystander was also shot and treated for non-life-threatening injuries. Mo3 died at a hospital.