USC running back Ronald Jones is wearing No. 4 in honor of former Trojans running back Joe McKnight, who was killed in Louisiana last month.
McKnight was reportedly in a conflict at a highway intersection and attempting to apologize to another man, who then shot him more than once.
Ronald Gasser was initially released without charges but later arrested and jailed on a charge of manslaughter.
• Investigation of former NFLer Joe McKnight's killing
McKnight was a star for USC from from 2007 to 2009 and went on to play three seasons with the New York Jets and one season with the Kansas City Chiefs.