Ethan Lopez pleaded guilty in October to one count of voluntary manslaughter and one count of assault with a firearm.
He received a 16-year sentence.
Court records show Sage Martinez pleaded no contest to one count of voluntary manslaughter.
He will serve seven years.
The Fresno County Sheriff's Office says 18-year-old Ruben Velazquez and a 17-year-old boy were shot as they were sitting in a car near J and 10 streets in March 2023.
Both teens were rushed to a local hospital, where Velazquez later died.
Detectives say evidence showed the teens had been targeted.