
BY Peter D’Abrosca | FOX NEWS
Scott Kimball received 70-year sentence for killing four people while working as confidential informant
DENVER – A former FBI agent says a serial killer who doubled as an FBI informant for years manipulated agents into believing he was helping them, all the while preying on unsuspecting victims.
Scott Kimball will likely spend the rest of his life in a federal prison in Colorado after he was sentenced to 70 years in 2009. He pleaded guilty to killing four people between 2003 and 2004, and his number of victims could be much higher, according to former FBI Special Agent Jonny Grusing.
“He made a game out of tricking the FBI,” Grusing told Fox News Digital, adding that Kimball’s case was unprecedented. “As long as he won the game in front of him, that’s all that mattered.””To have someone who enjoyed manipulating us, putting stuff in our files, and then making people disappear was beyond anything I’d seen,” Grusing said.
“To have someone who enjoyed manipulating us, putting stuff in our files, and then making people disappear was beyond anything I’d seen,” Grusing said.
Kimball, now 58, was a known serial fraudster who spent time in and out of prison during his youth and early adulthood. In the 1990s, he practiced working the criminal justice system, becoming an informant for local police and blaming his own crimes on cellmates.
After a 2001 arrest for check fraud in Alaska, he befriended his cellmate Steve Ennis, who had been charged in a drug case. To snake his way into a role as an FBI informant, a calculated Kimball convinced Ennis that he could make the drug case go away, and that he had powerful connections that could have witnesses “taken care of.” During the jail stint, he also befriended Ennis’ girlfriend, a stripper named Jennifer Marcum.
After planting the seeds of a murder-for-hire plot, Kimball reported to the FBI that Ennis was planning to have witnesses killed, and shortly thereafter, was granted confidential informant status. He was moved to a lower-security prison and eventually released.
![FD863768-0ACF-495E-9D21-2EF784DFFA6B[1]](https://rockymountainvoice.com/wp-content/uploads/2026/06/FD863768-0ACF-495E-9D21-2EF784DFFA6B1-300x300.png)