NEWARK - (AP) - A northern New Jersey man convicted in theshooting death of a 13-year-old boy has been sentenced to 30 years inprison without parole.

Essex County prosecutors say James Johnson, of Irvington, was 18when he mistook Justin Grisham for another teen who had beaten himin a June 2009 street fight.

They say Johnson snuck up behind Grisham and shot him once inthe back of the head while the boy was talking with friends outsidea local home, then ran off. He turned himself in to police a fewweeks later after authorities had obtained a warrant for hisarrest.

A jury convicted the now 20-year-old Johnson of murder inJanuary, but he continued to maintain his innocence during Friday'shearing in Newark.