Key Witness Says Colorado Man Fatally Beat Fiancee With Bat

L: Patrick Frazee (Teller County Jail); Kelsey Berreth Courtesy of Family of Kelsey Berreth's family via CNN

DENVER—A man beat his fiancee to death with a baseball bat, convinced a woman he was having an affair with to clean up a bloody crime scene and then burned the victim’s remains while she watched, investigators said Tuesday.