Serial killer Scott Kimball has been arrested for investigation of solicitation to commit first-degree murder and attempted escape.

An arrest warrant was filed Tuesday by the FBI against Kimball, who is being held in Sterling Correctional Facility.

Kimball, 51, allegedly plotted the escape and murder between May 6 and Sept. 22 while he was incarcerated in Sterling, according to Logan County District Court documents.

Kimball, an FBI informant-turned-serial-killer, is serving a 70-year sentence for four murders committed after he was released from federal prison in December 2002 to act as an FBI informant. He’s also serving 48 years for fraud and 70 months on a federal gun charge.

Kimball, a lifelong con man with four felony convictions, was released from prison on Dec. 18, 2002, to act as an FBI informant after convincing federal agents that his cellmate, Steve Ennis, had asked him to kill a witness in a drug case.

Less than a month later, LeAnn Emry, 24, vanished. Ennis’ girlfriend, Jennifer Marcum, 25, disappeared a month after that, and Kaysi McLeod, 19, went missing in August 2003. Then, some time in mid-2004, Kimball’s uncle, Terry Kimball, 60, vanished.

Scott Kimball was the last to see each of them alive. In early 2006, after Kimball was named a suspect in yet another check-fraud case, he fled to California, where he was arrested after a televised car chase and standoff.

That same year, the fathers of McLeod and Marcum pressed the FBI for a new investigation, and Kimball’s elaborate web began to unravel. He ultimately agreed to plead guilty to second-degree murder in the four killings.

A hunter found McLeod’s remains in a forest in Jackson County in north-central Colorado in 2007, and Kimball eventually led authorities to Emry’s body in a Utah canyon and to his uncle’s remains in a forest near Vail Pass.

He has never revealed the location of Marcum’s body.

In June 2003, Kimball told FBI Agent Carle Schlaff that a drug dealer had killed Marcum. He said a friend of a former cellmate had shown him a photograph of Marcum with her hands and legs bound and her mouth taped shut, according to an affidavit.

Kaysi McLeod was reported missing in August 2003. She was never seen after Kimball was supposed to pick her up from a Thornton hotel. Kimball married Kaysi’s mother, Lori, later that year.

Terry Kimball, 60, disappeared in late 2004, shortly after he began to stay with Scott Kimball. Scott Kimball told people his uncle won a lottery, then went to Mexico with a woman.

Emry, 24, disappeared between Moab and Washington state in 2003. In January 2003 she told her father, Howard, that she was planning a camping trip. Her car was found in Moab.