MORRISTOWN, NJ – A Stanhope man faces up to 10 years in state prison, and fines of up to $150,000, for sexually assaulting a Roxbury girl he babysat when she was four and five, authorities said today.

The man, Cameron Muir, 23, was found guilty Dec. 21 of two counts of second-degree sexual assault and two counts of third-degree endangering the welfare of a child, said the Morris County Prosecutor’s Office. The verdict came after a 10-day trial in Passaic County, said Peter DiGennaro, a spokesman for the prosecutor’s office.

Muir was arrested after the child, on March 25, 2012, told a family member she’d been sexually assaulted twice by Muir, who was babysitting.

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“The first act occurred when the victim was four years old and the defendant was 17 years old,” said the prosecutor’s office and Roxbury Police Chief Marc Palanchi in a statement. “The second act occurred when the victim was five years old and the defendant was 18 years old.”

The jury that heard the case acquitted Muir on a more serious charge: first-degree aggravated sexual assault, said the authorities.

Muir was free on $75,000 bail up until the verdict. After being convicted, he was placed in the Passaic County jail. He is scheduled to be sentenced April 25, said the statement.

At sentencing, the judge could not only direct Muir to spend five to 10 years in prison but also stipulate he be subject to parole supervision for life and register as a sex offender, said DiGennaro. He said a fine of up to $150,000 can be imposed as well as “various other monetary penalties.”

Morris County Prosecutor Frederic Knapp thanked the Roxbury Police Department, especially Roxbury Police Lt. Dean Adone. He also thanked his office’s sex crimes/child endangerment unit, especially Sgt. Marshall Wang.