Police said Brooks killed 19-year-old Brant Daniels and wounded his friends in May 2007. They had apparently gone to Brooks' apartment to look for their stolen PlayStation.
Brooks was a freshman at California State University, Fresno, at the time.
At his trial, Brooks said he acted in self-defense because he feared they were going to attack him.
However, a jury found him guilty in April of first-degree murder and attempted murder.