A Biddeford man who was convicted on an interstate pimping charge for bringing a woman in her late 50s from Maine to prostitute her in New Hampshire was sentenced Friday to 51 months in federal prison.

Leo Grondin, 49, was also sentenced by Judge Nancy Torresen in U.S. District Court in Portland to serve five years of supervised release after completion of his prison term.

Biddeford police got a tip in the case against Grondin last July 9, when the daughter of the woman in her 50s called to report that she had discovered emails about prostitution on her mother’s cellphone and that her mother admitted when confronted about the emails that Grondin was prostituting her and other women, according to court records.

Leo Grondin

Police tracked Grondin and the mother to a hotel in Dover, New Hampshire, last July 17 after discovering another online advertisement with Grondin’s phone number and a picture of the mother. Police took Grondin into custody there on an outstanding arrest warrant issued by New Hampshire authorities.

The woman agreed to let police give her a ride back to Maine and tell them about the prostitution business, court records say.

Grondin pleaded guilty last Sept. 29 after being indicted by a federal grand jury on a felony charge of transporting an individual in interstate commerce with intent that she engage in prostitution.