"I thought I heard plastic... like a boom, a hit," said Brenda Hamouda, an Anaheim resident.
Police say Gamez was not in a crosswalk or at a traffic signal. The driver never stopped to help.
"I think it's disgusting," Hamouda said. "It's sad for the family and the person who hit him. He won't be able to sleep at night. I hope he comes forward."
Police believe Gamez had been hit only a few minutes before someone discovered his body in the street and called 911.
"At that time of day, somebody saw something," said Robert Higgins, an Anaheim resident. "There's always traffic here."
It's the second hit-and-run in west Anaheim in a week. On July 4, Alfredo Morales was killed when a vehicle hit him as he crossed Cerritos Avenue near his home around 11:30 p.m. Like the most recent accident, the driver never stopped. Police believe the vehicle was dark blue because they found paint chips at the scene.
"We need the public's assistance," said Anaheim Police Sgt. Tim Schmidt. "Somebody knows something. Somebody saw something. Somebody told somebody about the accident they witnessed or even the actual driver."