Christopher Reyes, 30, heard his fate in the South Bay Courthouse in front of more than a dozen members of the victim's family.
"I’ll forgive you someday but it’s not going to happen anytime soon," said the victim's cousin, Richella Tamondong.
Reyes admitted to the hit-and-run and for leaving the scene after killing a motorist changing a tire in the center divider of southbound Interstate 5 near National City.
Raymart Martos, 21, died at the scene after celebrating his birthday a week earlier.
"For you not to see my son and leave him in the ground, you didn’t even stop and look at him," said the victim's father, Raymond, in a statement.
A southbound Dodge Stratus struck Martos on December 15 near Mile of Cars Way, then crashed into a divider wall.
"We couldn’t recognize him in the coffin, his face was deformed," said Tamondong.
Attorneys stated Martos was changing a flat tire on the front passenger side of his car before getting hit by Ramirez traveling 65-70 miles per hour.
Reyes faced up to 4 years in prison.