10/26/2012 08:06 am ET Updated Oct 26, 2012

'Very Bad Men': Vietnam Veteran And Former Police Officer Became Professional Hitman (VIDEO)

"Very Bad Men" told the disturbing story of Gary Krueger, a former police officer turned cold-blooded killer. Krueger was a Vietnam veteran who went on to become a cop, and then a criminal.

Police matched Krueger’s DNA to the murder of Washington state realtor Mike Emert -- a brutal stabbing that police said left blood “everywhere.”

But Krueger was dead. His body had been found at the bottom of a lake. Investigators believe he’d drowned while trying to flee a home invasion gone wrong. They then started to connect different cold cases together.

As they investigated further, police discovered that Krueger was buried in gambling debt and had apparently become a professional hitman. "Write up a terrible, evil character. A serial killer, a man with no soul, and think it’s fiction. But you’re really writing about Gary Krueger," said journalist Chris Halsne.

Local reports from Seattle said that Krueger had a "mean reputation" as a police officer in the 1970s. After that, he reportedly robbed about a dozen banks.

Still, there are many open questions about Krueger's life and crimes that may never be answered.

More true stories of "Very Bad Men" are revealed every Thursday at 10 p.m. ET on ID.

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