"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."

Another FBI success story handling informants, right up there with Whitey Bulger. 

You really have to wonder about the FBI given their recent history. They knew about and interviewed the Boston Bombers, Orlando, San Bernadino Islamic Terrorists before their attacks.

They definitely need to do some work on their interviewing skills.