LAKEWOOD, Colo. (CBS4) – The Lakewood Police Department is investigating a suspicious death as a homicide.

On Tuesday Corey Anthony Lopez, 21, called police saying his girlfriend was unresponsive. When officers arrived they found the body of 21-year-old Richelle Best.

An autopsy found the cause of death as non-visible trauma.

Lopez was arrested on suspicion of first-degree murder and domestic violence. He’ll be in court on Monday.