A Keene man was sentenced to one year in jail and five years probation for sexually assaulting a 14-year-old girl in Ashuelot River Park in the city.

Harrison S. Chambers, 29, pleaded guilty to felonious sexual assault and three felony counts of possession of child sexual abuse images as part of a plea deal he reached with county prosecutors.

Keene police said Chambers met the girl on the Internet site MYLOL.com, a teen social networking site, and the two made arrangements to meet at the park June 14, where they had sexual intercourse.

After the incident, the girl called her mother and the two went to Cheshire Medical Center/Dartmouth-Hitchcock Keene, according to Keene police Detective Jennifer M. Ramey. That’s when police began their investigation, which culminated June 25 with Chambers’ arrest.

On that day is when police say they found him in possession of child pornography.

Police had initially charged Chambers with certain uses of computer services prohibited for allegedly luring the girl to the park for sex. However, a grand jury did not indict him on the latter charge in August.

Assistant Cheshire County Attorney Kathleen G. O’Reilly said a victim witness advocate had been in regular contact with the victim’s father, and that he did not want to make a statement at Monday’s plea and sentencing hearing.

Public defender Caroline L. Smith said Chambers took full responsibility for what happened in June from the start of plea negotiations. She said he is looking forward to counseling and to bettering himself.

In addition to his 12-month jail sentence on the sexual assault charge, Chambers was sentenced to a suspended three to six years in N.H. State Prison on the child pornography convictions. He was credited with 70 days already served while awaiting the resolution of his case.

He must undergo a psychosexual evaluation and is prohibited from having any contact with the girl. He must also register as a sex offender.

Alyssa Dandrea can be reached at 352-1234, extension 1435, or adandrea@keenesentinel.com. Follow her on Twitter @ADandreaKS.