A Monmouth County man has been arrested and charged with attempted sexual assault, luring and endangering the welfare of a child and could face up to 15 years on prison, Monmouth County Prosecutor Christopher J. Gramiccioni announced on Friday.

William McMahon, 64, of Keansburg, is charged with one count each of second-degree attempted sexual assault, second-degree luring or enticing child, third-degree attempted endangering the welfare of a child.

McMahon was arrested as a result of an undercover investigation conducted by the Monmouth County Prosecutor’s Office Computer Crimes Unit and Monmouth County Internet Crimes Against Children (ICAC) Task Force that commenced in late July.

The case background … 

An undercover detective, posing as a 14-year old boy, responded to an-online posting by McMahon seeking to have a “sleep over” with the child. During the course of further on-line discussions, McMahon made clear his interest in having sex with the juvenile.

On Aug. 3, McMahon traveled from his home in Keansburg to an indoor entertainment center in Freehold Township, where he believed he would meet the 14-year-old boy to further his plan to sexually assault the minor.

McMahon was found outside the venue and subsequently arrested by officers from the Monmouth County Prosecutor’s Office and U.S. Bureau of Homeland Security.

If convicted of second-degree attempted sexual assault and luring charges, McMahon faces a maximum sentence of 10 years in New Jersey state prison, Megan’s Law, and parole supervision for life. If convicted of the third-degree endangering charge, McMahon will face a maximum sentence of five years in state prison.

McMahon remains incarcerated in the Monmouth County Correctional Institution in Freehold since his arrest. He is scheduled to have a detention hearing on Aug. 9 in front of Monmouth County Superior Court Judge James J. McGann at 9 a.m.