MADISON, Wis. -- The Madison police Friday are still processing the home of the University of Wisconsin-Madison student who was found slain in her apartment on Wednesday afternoon.

Police said on Friday that they're investigating the killing of Brittany Sue Zimmermann, with the help of analysts from the State Crime Lab. They said that forensic analysts are already expediting the examination of some items found that might have evidentiary value.

Zimmermann, 21, of Marshfield, was found on 500 block of West Doty Street on Wednesday. Her fiancé found the woman's body in the first-floor apartment in a two-flat house that they shared at about 1 p.m. Police said that the fiancé isn't considered a suspect.

On Thursday, officers delayed garbage pickup in the West Doty Street area and were searching nearby garbage bins. They also blocked garbage pickup in the 500 blocks of Bassett and Main as they searched for evidence.

One refuse hauler dumped his load of garbage at a Madison Streets garage facility, and officers in hazmat suits were expected to sift through it, searching for any potential evidence, WISC-TV reported.

Meanwhile, officers and detectives have spoke with numerous residents, commuters, business owners and transients in the neighborhood, police said.

They said that received more than 75 tips from Crime Stoppers, many from people reporting that strangers came to their doors or into their homes in recent weeks. Other tips came from downtown residents who said that they saw people going door-to-door, asking for money on the day of Zimmermann's killing.

Police also are investigating whether there is a connection between the homicide and an incident that happened around the same time Zimmerman's body was found. A man entered a house shared by several UW students just after four people left, leaving the door unlocked. The intruder left quickly after a student who remained in the house told him to leave.

Lt. Joe Balles said neighbors in the area where Zimmerman was killed are regularly approached by transients asking for money. Balles said that investigators haven't determined a homeless person killed Zimmerman.

City Council President Mike Verveer, who lives in the neighborhood near campus, said that it's possible a transient person simply has information that could be helpful to police.

Madison police said that they don't have a suspect or suspects in the slaying nor a motive. They said that Zimmermann's slaying might have been a random act.

The Dane County coroner's office conducted an autopsy on Thursday. Coroner John Stanley said determined Zimmerman died from a series of traumatic injuries, saying that it was the result of "a complexity of traumatic injuries."

Authorities said that Madison and UW police officers are increasing foot patrols in the Bassett street neighborhood.

UW To Hold Vigil On Sunday

UW-Madison officials are remembering Zimmermann as a driven student who had a bright career in front of her in the field of public health.

UW officials said that a memorial vigil for Zimmermann has been scheduled for 7:30 p.m. on Sunday on Library Mall. Berquam will lead the ceremony, along with student representatives from Associated Students of Madison, the Wisconsin Union Directorate and the Union Council, according to a UW news release.

A member of the Dane County's Victim Witness unit is working with Zimmerman's family and she will be keeping them posted on developments in the case, WISC-TV reported.

Authorities said that anyone with information about Zimmermann's death should contact Crime Stoppers at 608-266-6014.

Stay tuned to WISC-TV and Channel 3000 for continuing coverage.