SALT LAKE CITY (AP) — Police in Colorado plan to seek murder charges against an ex-convict suspected of killing a man, stealing guns from his trailer, then heading to Utah and fatally shooting a student during an attempted carjacking.

Austin Boutain and his wife, Kathleen Boutain, were both named as suspects Wednesday in the death of 63-year-old Mitchell Ingle, whose body was found in his trailer Tuesday, Golden, Colorado, police spokeswoman Karlyn Tilley said in a statement.

Investigators believe the Boutains met Ingle only a few days before his death, describing their encounters as "chance m...