Leslie Hansen was a brilliant trauma surgeon who worked alongside Dr. Karl Malus at IGH. Hansen was responsible for bringing Alisa Jones into the program. Years later, Dr. Hansen was killed by Alisa as she sought to stop Trish Walker from discovering anything about IGH. She subsequently cremated Hansen's remains in her building's furnace. By the time Jones and Walker arrived, only Hansen's charred head survived the fire. Unaware of the head's identity, Jones smuggled it into a morgue and forged a work order to get the coroner to identity it.