SAN ANTONIO – A convenience store clerk shot several times during what police believe was a robbery died at a hospital Tuesday morning.

Police said they were called to a 7-Eleven at Interstate 10 and Callaghan Road around 4:30 a.m. for a robbery and found 42-year-old Timothy Deshawn Collins with multiple gunshot wounds as customers attempted to assist him. Police said that Collins attempted to stop the robber when the robber shot him multiple times.

The clerk's sister said trying to stop a robber is something her brother would do.

"I’m sure my brother didn’t do this just out of a whim. He did it to help somebody else. He probably did it because he felt for the owner, or he thought maybe was going to be able to save the day," said Mary DeLuna.

Collins died at University Hospital. The gunman was last seen running toward the highway, police said.

Authorities described the gunman as a 6-foot-tall man wearing a hoodie.

Police continue to investigate.