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Henry Mesner is the main antagonist of the Law & Order: SVU episode: Born Psychopath.
Henry Mesner is the older brother of Ruby Mesner whom he abuses. It is also shown that Henry is a psychopath. He has committed many atrocities in the episode, which include: Abusing and nearly killing his younger sister, cutting his mother's hand with a knife he stole, nearly burning down his apartment almost killing his mother and sister (His father left for work), drowned a neighbor's dog in their tub, stealing a neighbor's gun, taking a 5 year old hostage and nearly killing Detective Amaro.