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FBI informant revealed as serial killer, fmr. FBI agent says

FBI agents. (Melanie Rodgers Cox/US Air Force)
October 09, 2025

A former Federal Bureau of Investigation (FBI) agent recently revealed that a former FBI informant was a serial killer who manipulated agents and preyed on numerous victims.

Fox News reported that Scott Kimball, a former FBI informant, was sentenced to 70 years in prison in 2009 after pleading guilty to killing four people from 2003 to 2004. However, former FBI Special Agent Jonny Grusing told the outlet that Kimball allegedly admitted to murdering as many as 45 or 50 people.

Grusing told Fox News that Kimball “made a game out of tricking the FBI.” “As long as he won the game in front of him, that’s all that mattered,” Grusing said.

The former FBI agent added, “To have someone who enjoyed manipulating us, putting stuff in our files, and then making people disappear was beyond anything I’d seen.”

According to Fox News, Kimball was a serial fraudster who manipulated the U.S. criminal justice system by serving as an informant for police officials and blaming his crimes on his prison cellmates in the 1990s.

Fox News reported that after being arrested for fraud in 2001, Kimball became an FBI informant by convincing his cellmate, Steve Ennis, that he could have witnesses in his drug case “taken care of.” Kimball sparked a murder-for-hire plot and reported to the FBI that Ennis intended to have witnesses killed. Kimball’s actions later allowed him to become a confidential informant for the FBI.

According to Fox News, Kimball also used his time in jail to befriend Ennis’ girlfriend, Jennifer Marcum, who was a stripper at the time.

“Our primary victim in our case was Jennifer Marcum,” Grusing told Fox News. “Mainly, he convinced Steve [Ennis] to hook him up with Jennifer to get Jennifer out of stripping. So, at the same time he’s making Steve look like the bad guy, he’s taking Jennifer and isolating her and killing her.”

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By February 2003, Scott was a bona fide informant operating throughout the western United States, and Marcum was dead. 

During his several-year span as an informant, Kimball was responsible for killing four people, including Marcum. He would later confess to killing at least 21 people, and according to Grusing, told his own attorneys, he was responsible for 45 to 50 killings. His other alleged victims all remain unnamed. 

In each case, the serial killer provided “breadcrumbs” to the FBI that ended up in the case files, including that he was the last person to be seen with two of the victims. 

In 2006, pressure from victims’ family members forced the FBI to begin investigating its own informant. 

“And that’s when two dads came to the FBI office to talk to my boss and say, not only was Scott responsible for Jennifer’s disappearance, but another girl named Kayci was last with Scott, and that reporting was in the case file,” said Grusing. “But Scott had mastered such that, again, he enjoyed the game, and it was like leaving little breadcrumbs to say, ‘I’m so good at this, I can tell you about these homicides, and you’ll never know I’m doing them.'”

In March of 2006, Kimball was arrested in California on fraud-related charges. 

While he was in jail, the FBI built a case against him, and in 2009, he was officially charged with the murders.