NFL's Chris Johnson -- $5,000 Reward for Shooter's Arrest

TMZ Sports has learned that the person who shot NFL running back Chris Johnson -- and killed his friend -- now has a $5,000 bounty on his (or her) head.
Law enforcement sources tell TMZ that investigators have been working to identify and locate whoever fired the shots in that fatal drive-by shooting in Tampa on March 8th. Johnson was hit in the shoulder. His pal "Rollie" was struck in the head and died from his injuries.
Sources tell TMZ that police have received several tips -- but so far, no arrests have been made.
TMZ says police are hoping that a $5,000 reward -- offered through the Central Florida Crimeline -- will motivate people to share information that will lead to the killer's arrest.