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This Sunday, we are presenting two all-new broadcasts, beginning at 7 p.m. ET/PT.
The FBI's Lin DeVecchio and "The Grim Reaper"
A former FBI agent says he considered his star Mafia informant - a hit man nicknamed "The Grim Reaper" - a friend and did not investigate when this informant let him know he had killed a rival mobster. CNN's Anderson Cooper reports.
