FBI Informant Charged With Four Murders

Oct. 7, 2009— -- Scott Lee Kimball was released from prison to become a paid FBI informant, married the unsuspecting mother a young woman he had allegedly murdered, and spent their honeymoon camping and off-roading in an area where her daughter's body was buried.

Kimball also used the alias "Hannibal" to befriend a prison cellmate's girlfriend who vanished, allegedly murdered by Kimball and buried in a remote Utah canyon.

Kimball has been in jail since 2005 on related charges, but grisly new details emerged in an arrest affidavit released Tuesday in Boulder, Colo. The court papers charge Kimball with being a serial killer, accused of murdering both missing women as well as a third woman and his own uncle.

Kimball, already sentenced to 48 years in prison on related charges, is being held on $2 million bail. He will be arraigned on the new charges Thursday.

His alleged victims include his uncle Terry Kimball, Jennifer Marcum, Kaysi McLeod and LeAnn Emery. Authorities believe the murders took place between August 2003 and September 2004.

The plight of families searching for the missing women and the slow pace of the investigation was the subject of a John Quinones story on "20/20" last year. Families also criticized the FBI for not keeping a better eye on Kimball after he was released to work as an informant.

Parents of the dead women say Kimball's arrest has been too long in coming, but are thankful it's finally happened.

"I'm ecstatic," said Kaysi's father Rob McLeod told ABC News. "Happy is the wrong word, but I can't think of another one."

Jennifer Marcum's father Robert said he's glad that Kimball has finally been charged in the crimes, and says he'll make the trip from Illinois to Colorado for Kimball's arraignment. Even though Kimball is expected to plead guilty, Marcum says he'll believe it when he sees it.

"The real thing will come when he's convicted of murder. Until then, I'm not getting my hopes up," Marcum said. "This guy has buffaloed people for so many years."

Marcum's remains have never been found. Her father hopes Kimball will have something to say about that in court.

"I want to hear if he'll say something we don't know, and I'd really like to know" he said. "She is really missed and loved and we are so unhappy it's unbelievable."

Kimball convinced authorities to let him out of prison in December 2002 in order to work as an informant in a murder-for-hire plot involving former cellmate Steven Ennis and his girlfriend, Jennifer Marcum, the 25-year-old mother of a 4-year-old boy. A few months later, Marcum disappeared.

According to the affidavit another former cellmate, Brett Lee Gamblin, told police that Kimball asked Gamblin if he thought breast implants could be traced. Gamblin wondered why anyone would be concerned with breast implants when a body could be identified by fingerprints or teeth.

Despite repeated searches, Marcum's remains have never been found.

In August 2003, Kaysi McLeod went missing.