Reno police released a composite sketch of a suspected rapist linked to a sexual assault in the area where a 19-year-old college student disappeared.

The sketch is "not inconsistent" with suspect descriptions in three other sexual assault cases near the University of Nevada, Reno campus, investigators say.

Brianna Denison, a freshman at Santa Barbara City College in California, was reported missing from a campus-area home after spending the night there. Search teams have combed the area daily since her disappearance but have found no sign of the missing girl.

Police have linked two attacks late last year on women near a university campus to the suspected abduction of Denison on Jan. 20. New DNA evidence ties Denison's abduction to a third attack in November.

The sketch, made from a woman's description from a previously unreported attack in October, shows a 5-foot-8 to 5-foot-10 white male with light brown or dirty blond hair. He had a slender to medium build and was wearing a dark-hooded pullover sweat shirt, athletic-type nylon sweat pants with black stripes and white tennis shoes.

A University of Nevada, Reno student said she was raped in a parking garage on Oct. 22, that was 100 yards from a campus police station.The woman said she reported the incident after seeing news reports of Denison's case. The October case has not been connected.

Holladay said there's no evidence that connects the October rape to the other incidents but that investigators are "not discounting the possibility these cases may be connected all together."

The woman described the weapon as a black and silver handgun, the first time police have reported the use of a gun in any of the attacks.

Police did not specify the age of the suspect in the October rape. In the other attacks, victims estimated the age range from 28 to 40.

On Dec. 16, another female victim was battered, kidnapped, sexually assaulted and then brought back home by the suspect, he said.

On Jan. 19, the night before Denison last was seen, an unknown suspect returned the home of the victim of the December attack and unsuccessfully attempted to break in, police said.

Crime lab technicians earlier determined a small stain on a pillow at the house where Denison vanished is the blood of Denison.

Investigators think someone entered through an unlocked door of the house rented by a Denison friend and three others. Denison, who was sleeping on a couch near a door, was last heard from at 4:20 a.m.

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The Associated Press contributed to this report.