FAIRFIELD - Police say they have charged an illegal immigrant with the sexual assault of a woman yesterday.

Officials say Jesus Montes Valera sexually assaulted a woman at knifepoint in his second-floor home on Halley Avenue.

The victim, identified only as an acquaintance of Valera, was taken to the hospital for treatment, according to authorities.

Police say Valera is being held on $500,000 bond.