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A man was arrested for allegedly sexually assaulting and killing a minor boy after he tried to resist from the crime, police said today. The accused, Amar Nath, was traced after the victim's friend helped the police in getting his sketch prepared, they said. On February 28, a resident of Jaitpur approached police with a complaint that his 11-year-old son was missing and expressed a suspicion that he had been kidnapped, the police said.