After an investigation, police arrested Steven W. Newman of Phillipsburg on Friday.
He is charged with first-degree aggravated sexual assault, second-degree endangering the welfare of a child and fourth-degree lewdness.
The investigation revealed the victim was younger than 13 years old.
Police say the crimes occurred in the Flemington Borough.
Newman was sent to Somerset County Jail and is awaiting his first court appearance.
Anyone with information is asked to call the Hunterdon County Prosecutor's Office Special Victims Unit at 908-788-1129.
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