Man serving life sentence for murder of 6 people given death penalty for killing 7th 45-year-old once known as the Monster of Mayport Published: Tags: Billy Wells sentenced to death Tuesday after his seventh murder conviction. (Florida Department of Corrections) JACKSONVILLE, Fla. – Billy Wells, who earned the nickname “Monster of Mayport” after five bodies in varying states of decomposition were found in his Mayport mobile home in May 2003, was serving a life sentence at Florida State Prison when he killed again. Wells killed his wife and four other family members in a Mayport doublewide and lived there for another week with his 4-year-old son before he was arrested.