LOCKPORT – Isaac L. McDonald, a Niagara Falls man accused of raping a 15-year-old girl last year, was told Thursday by Niagara County Judge Sara Sheldon Farkas that he if he doesn’t make a plea deal by March 12, he must go to trial April 8 on charges that carry a possible life prison sentence.

McDonald, 29, of 24th Street, a Level 3 sex offender because of two previous convictions for having sex with underage girls, is accused of seven sexual encounters with the current complainant last spring, including one alleged forcible rape.

Thursday, Farkas rejected a defense effort to invalidate McDonald’s arrest while staying at a friend’s home, because he had no expectation of privacy there, and the resident let police in to look for McDonald. Also, Farkas said, anywhere he was living had to be a matter of public record because of his status as a registered sex offender.