Kenny Ring, 24, died at WakeMed around 5 p.m. Monday. Doctors say he suffered a head trauma following the attack.
Now, his father is speaking out in hope of catching the suspect.
"There's no justification for what was done," said Dan Ring, Kenny's father.
Ring said he had all the hope in the world that his son would recover from his head trauma injuries and continue living.
Kenny was working late Friday night when robbers broke in, stole cash, attacked him and ran.
Just after midnight, a delivery driver got back from his last call to find Kenny unconscious inside the store.
Police said he'd been beaten in the head with an unknown type of weapon.
Less than $1,000 was stolen from the store.
"There's not enough money in the world to make it worth someone's life," Ring said.
Some workers said they were nervous to return to work after learning what had happened. Managers said they are now stepping up safety measures.
Employees said that all the locks have been changed, the door handle on the back door has been removed on the outside and most importantly surveillance cameras would soon be installed.
Meanwhile, Knightdale Police said they would start working with the Wake County Sheriff's office, but there are no suspects.
"There are individuals out here that know what happened that night, know what happened to Kenny, know who was there and I would really like them to come forward and present themselves to police," Ring said.
Kenny was a graduate of Wake Forest-Rolesville High School and was recently promoted to assistant manager at Domino's.
Anyone with information about the robbery should call the Knightdale Police Department.
Domino's Pizza is offering a $5,000 reward for information leading to an arrest in the case.
In lieu of flowers, the family would like donations to be made to East Wake Crimestoppers.
According to police, this is the first murder in the history of Knightdale.