BUSHWICK, Brooklyn (PIX11) -- Police in Brooklyn are searching for an 81-year-old man who may be the suspect in the stabbing death of a 21-year-old Brooklyn man early Sunday.

Police arrived to 1225 Broadway in Bushwick at 2:17 a.m. to find Kevin Rivera with a stab wound to his chest.

Rivera was taken to Woodhull Medical Center where he was pronounced dead.

Police later identified the suspect wanted in connection with the stabbing, 81-year-old Nicolas Diaz.

Sources say Diaz is the grandfather of Rivera's girlfriend.

No arrests have been made at this time. The investigation is ongoing.

Anyone with information about the suspect's location is asked to call NYPD's Crime Stoppers Hotline at 800-577-TIPS. The public can also submit their tips by logging onto the Crime Stoppers Website or texting their tips to 274637 (CRIMES) and then enter TIP577. All calls will be kept anonymous.