Dead By Sunset, by Ann Rule

This is the true story of the murder of Cheryl Keeton on September 21, 1986. She was found bludgeoned to death inside her Toyota van, blocking traffic on an Oregon freeway. The only suspect was her husband, Bradly Morris Cunningham, but there was no physical evidence left at the scene to prove him guilty. Brad was a charismatic, intelligent manipulator, married 5 times (to women that he abused behind closed doors). It took eight years before he was arrested and tried for the murder of Cheryl, the mother of his three young sons. He was sentenced to life in prison in 1995.