MILWAUKEE (CBS 58) -- The Milwaukee Police Department along with the FBI are offering a $10,000 reward for information leading to the arrest of attempted homicide suspect, Keasean Ellis-Brown.

Authorities say 19-year-old Ellis-Brown was involved in the shooting of an off-duty MPD detective at the Shake Shack in the Third Ward on Jan. 13. 

The detective was trying to help a woman as she was being attacked by Ellis-Brown, officials say. 

Officials say Ellis-Brown fired multiple rounds at the detective, striking him multiple times, and fled the scene.

Two additional subjects involved in the shooting have already been arrested and charged in the case.

Ellis-Brown is charged with attempted first-degree intentional homicide, and considered armed and dangerous.

Police say do not approach Ellis-Brown. If you have any information regarding his whereabouts, please contact the Milwaukee Police Department at (414) 935-7360 or to remain anonymous, contact Crime Stoppers at (414) 224-TIPS or P3 Tips App.