A northern Indiana teenager has pleaded guilty to a murder charge, testifying that he knocked on a man's apartment door and shot him because of a gang dispute. Nineteen-year-old Miguel Martinez-Villasenor of Elkhart accepted a plea agreement in court Thursday that calls for a 60-year prison sentence for the March shooting of 26-year-old Anthony Perez at an Elkhart apartment complex. Martinez-Villasenor told the Elkhart County judge that he and Perez were friends and members of the same gang, but he committed the shooting because Perez had recently posted a photograph disrespecting their gang. Martinez-Villasenor fled to Chicago after the shooting and was arrested there in May. His sentencing hearing is scheduled for Oct. 9.