Collins is a victim in Dead Rising 3.
He is one of the soldiers that was apart of Adam Kane's unit during the Operation Broken Eagle DLC. Now infected, he can be found on the staircase leading up to the Yoh-Gah! gym in Sunset Hills.
He will drop his dog tag when killed, and Kane can retrieve it for 5,000 PP. Retrieving the dog tags of all eleven deceased soldiers will unlock the Rest in Peace achievement.