A delivery employee called 911 just before 1 a.m. Saturday to report that he found Kenneth "Kenny" Ring on the floor of the Knightdale store, at 2001 Widewaters Parkway. The caller told 911 operators that, at one point, Ring was conscious.
Ring, 24, died Monday afternoon at WakeMed, where he was being treated for blunt force trauma.
Knightdale Police Chief Shawn Brown said investigators have no suspects and are asking that anyone who was in the area of the restaurant from midnight to 12:39 a.m. Saturday to contact them at 919-217-2261.
"Any possible information, no matter how insignificant it may seem, would be greatly appreciated," investigators said in a news release issued Monday afternoon.
Brown did not say why investigators were searching Ring's Raleigh home, at 1128 Treasure Chest Cove.
The death marks the first homicide within the Knightdale town limits.
Detectives with the State Bureau of Investigation, Wake County District Attorney's Office, Raleigh Police Department and Wake County Sheriff's Office are assisting in the investigation.
Meanwhile, Domino's has offered a $5,000 reward for information in the case that leads to a conviction, and a fund has been set up with Eastern Wake Crime Stoppers for donations to add to that reward money.
Contributions may be made to Eastern Wake County Crime Stoppers, c/o BB&T/Kenny Ring, 1204 N. Arendell Ave., Zebulon, N.C. 27597.