Man helps catch thief who robbed his grandma

The officer caught up with the guy, tackled him, they wrestled, but then suddenly the officer realizes he's off-duty. No handcuffs, no gun, no cell phone. He got the necklace for grandma, but thought it was safer to let the guy go. When he returned to Red Robin everyone was fine. Grandma had some bruises on her neck.

Customers said they saw the guy two blocks down at a BP Gas Station. The suspect lost his get-a-way ride.

Detroit Police arrested Antoine Jackson, he's 17. He is being charged as an adult. The grateful off-duty officer says he's thankful for people who stepped up to help contribute to the arrest.