Karr was convicted of extorting money from missing atheist Madalyn Murray O'Hair and her family. The trio have been missing since 1995. Bodies Still Missing Karr's criminal history dates to 1966 with convictions for armed robbery, aggravated kidnapping and indecent liberties with a child. He had been released from a 20-year prison term just a few months before the O'Hair family disappeared.
Investigators say the missing atheist family was kidnapped, killed and dismembered.
Their remains have never been found. Although investigators have identified other suspects and say the case remains open, Karr was the only person charged. Sparks gave Karr another life sentence for traveling across state lines to commit a violent act. Karr also received two 10-year terms for committing a criminal act to gain financially and interstate transportation of stolen property. All of the sentences will be served concurrently.