Reported by Rupa Shenoy. Designed & produced by Brendan Lynch.

Data compiled from news reports, releases from district attorneys, court files and law enforcement agencies. NOTE: Descriptions are based on information provided by law enforcement.

Not included in our data: Kevin Ambrose, 56, Male, white, on June 4, 2012, at 90 Lawton St, Springfield, MA 01109, of a gunshot from a New York City corrections officer. A grand jury indicted Shawn Bryan, 34, of Hempstead, N.Y., on charges including murder and armed assault with intent to murder. Charlene Mitchell reported that off-duty prison guard Shawn Bryan was near her apartment in violation of a restraining order. Officer Kevin Ambrose responded to the call and attempted to force entry to the apartment into which Bryan had taken Mitchell. Bryan shot Ambrose through the door, shot Mitchell, then shot himself. Ambrose and Bryan died of their wounds.

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