CHELSEA – Since the 1990s, Leroy Martin has been imprisoned at least twice and has used at least six aliases, officials said. On Thursday, officials said he has been using a new name – “Hitman.’’

Martin, 34, was arraigned in Chelsea District Court on charges including illegal sale of a firearm and ammunition and carrying a firearm without a license. Martin, a Brighton resident, pleaded not guilty to all charges and was ordered held on $100,000 cash bail.