Now, police are hoping a sketch of the suspect will lead to an arrest.
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Officers were called to a home on Andria Avenue in Hillsborough around 10:20 p.m. on Thursday for a report of a sexual offense.
When officers arrived on the scene, they were met by a woman who said she had been groped in the shower.
Police said the male suspect entered the shower naked and grabbed her from behind.
The victim was able to fight back, and the suspect ran out of the bathroom and fled the home, possibly through a screen door.
The woman was not injured.
The suspect is described as being approximately 18 to 24 years old with a thin build, short dark colored hair, and no facial or body hair.
Anyone with information is urged to call the Somerset County Crime Stoppers' Tip Line at 1-888-577-TIPS (8477).
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All anonymous STOP it reports and Crime Stopper tips will be kept confidential.