A South Boston man pleaded guilty Wednesday in two decades-old killings, one of which investigators believe had ties to notorious South Boston mobster James "Whitey Bulger .

Michael Lewis, 65, reached a deal with prosecutors to plead guilty to two counts of manslaughter related to homicides that occurred in 1984 and 1993, the Suffolk District Attorney's Office said.

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Lewis was first charged with murdering 46-year-old William Villani in Villani's office at Two Sterling Square in South Boston, prosecutors said. Lewis worked for Villani at the Boston Housing Authority Pest Control Unit. Villani went to his office on April 16, 1993, and his body was found the following day. He had been beaten, stabbed and shot.

Lewis

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