MADISON, Wis. (AP) -- It turns out that a University of Wisconsin-Madison student tried to call 911 on her cell phone as she was about to be murdered. But the dispatcher couldn't get any answer on the phone and no police were sent to try to see what was wrong.

Twenty-one-year-old Brittany Sue Zimmermann of Marshfield was a top student and hoped to be a physician. Her fiance found her dead at their off-campus apartment near the state Capitol April 2nd.

No one has been charged in the death.

Madison Police Chief Noble Wray says it's too early to know whether a police response to the 911 call could have prevented the murder or helped capture her killer.

But Wray says an officer should have been sent.