A 30-year-old Sandy man was charged in 3rd District Court on Thursday in an assault that took place on the University of Utah campus Tuesday.

The man previously had made sexual advances toward his female victim while they worked together at the U., according to documents filed in court Thursday. The advances were unwanted, and the woman asked the man to quit.

On Tuesday, the woman saw the man waiting by her car and felt unsafe. She walked back into her building and waited. Later, when she thought the coast was clear, she returned to her car, according to the filing.

Suddenly, the woman was hit from behind with a rubber mallet. Her head was beaten severely, according to the filing. The assailant then allegedly tried to force the woman into the back seat of the car and tape her mouth shut.

The attacker was unsuccessful in trapping the woman, according to the filing. Her blood and tears kept the tape from sticking.

The woman was able to bolt to the driver's seat. She then drove away and flagged down a campus police officer, though the assailant was still in her passenger seat and threatening her with a knife.

A man was taken into custody. He is being held in the Salt Lake County Jail on $250,007 bail.

He has been charged with aggravated kidnapping, a first-degree felony, and attempted criminal homicide, a second-degree felony. He alternatively could be tried for aggravated assault, a second-degree felony, and stalking, a Class A misdemeanor.

The woman was hospitalized. Her head was injured badly enough to require metallic staples and stitches.

If convicted on the first-degree felony, Qin Cai could spend life in prison. The second-degree felonies could be punished with up to 15 years in prison, and the Class A misdemeanor could result in up to one year of jail time.

E-mail: RPalmer@desnews.com