The victim, Stephen Rediker, 79, of New Haven, was riding a bicycle on College Street, between Grove and Wall streets, when he was struck around 5:41 p.m. on Nov. 7.
He was transported to Yale New Haven Hospital, in critical condition, and police said he succumbed to his injuries at the hospital.
New Haven police have been investigating and said they identified surveillance footage from the crash.
They are looking for a black 1997 to 2004 Ford F-150, single cab, two-door vehicle with a six-and-a-half foot bed, a black bed cap and tinted windows.
Police said the truck has black aftermarket wheels, large tires, four amber-colored lights in the grill and a single-step running board.
Witnesses who have not yet spoken with police are urged to call the New Haven Police Department Investigative Services Division at 203-946-6304.
Callers can remain anonymous or submit tips anonymously by calling 1-866-888-TIPS(8477), or text “NHPD plus your message” to 274637 (CRIMES).