Sells told authorities that he murdered Ena Cordt, 35, and her son, Rory Cordt, 5, in Forsyth, Mo, in 1985. Their bodies have been recovered and the evidence supports Sells' claim.

Sells is the primary suspect in the 1997 death of Stephanie Mahaney in Springfield, Mo.

Sells also has admitted to a double murder in New Madrid County, Mo., though his involvement in those killings has not been confirmed.