DENVER, Colorado (CNN) -- Serving time for lesser crimes, Scott Kimball is leading investigators to bodies.

Terry Kimball is one of several suspected homicide victims associated with Scott Kimball since his jailing in 2008. He is serving a 48-year sentence in state prison in Fairplay, Colorado, on theft and habitual criminal convictions.

Kimball will also serve a 70-month federal sentence on firearms charges after the state sentence. The firearms charges led to Kimball's 18th conviction.

However, Kimball probably will not be charged in any of the deaths.

Kimball drew the FBI's attention in 2002 while jailed for writing bad checks. Kimball offered authorities information about his cellmate, Steven Ennis, who was suspected in a drug ring, according to the 2007 affidavit. The FBI arranged Kimball's release and began paying him as an informant.

Kimball was supposed to report back to the FBI on Marcum, Ennis' former girlfriend, when she disappeared.