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LOCKPORT – A Level 3 sex offender is headed back to prison after admitting Wednesday that he had sex with a 15-year-old girl last year.

Isaac L. McDonald, 29, of 24th Street, Niagara Falls, pleaded guilty to third-degree rape, failure to register as a sex offender and disseminating indecent material to a minor as a sexually motivated felony.

McDonald could face up to 18 years in prison when Niagara County Judge Sara Sheldon Farkas sentences him Sept. 11. He had served more than five years after pleading guilty to two counts of second-degree rape in 2003, for having sex with 14- and 15-year-old girls.

McDonald was accused of having sex with the 15-year-old seven times from March 24 through May 10, 2012 – one one occasion, forcibly.

McDonald has been in Niagara County Jail, in lieu of $250,000 bail, for the past year.