MADISON, Wis. -

A 19-year-old University of Wisconsin student has been arrested after allegedly sexually assaulting a woman in her dorm room, police said.

The woman contacted the UW Police Department on Saturday to report that she had been sexually assaulted on May 2, according to a release. She told police she was in her residence hall in the southeastern part of campus when Douglas Gill entered her room and sexually assaulted her.

Police said the woman thought Gill had been drinking alcohol and snorting cocaine before the assault.

Investigators arrested Gill within a few hours on tentative charges of third-degree sexual assault and false imprisonment.

Madison crime stories from the past 12 months - locations are approximate