 After a police investigation, Marshall was arrested on December 19, 1984.The prosecution theorized that Marshall had hired two men to kill his wife so that he could collect on a $1.5 million insurance policy.Also arrested were 47-year-old Robert Cumber of Bossier City, Louisiana, 49-year-old James Davis of Shreveport, Louisiana and 42-year-old Billy Wayne McKinnon of Greenwood, Louisiana, who was a former Caddo Parish, Louisiana deputy officer.