Police in Davis have released the chilling 9-1-1 call made by a man police say killed his roommate.
Police say Joseph Hein called police after he shot Whitney Engler and before he shot himself.
Investigators say they've confirmed the chillingly calm voice belonged to Hein.
Engler was a fourth year UC Davis veterinary student who was set to graduate next month.
Two weeks later, police say they still have no idea what motivated the shooting.