As Madison Police Chief Noble Wray retires today, he says there’s one big disappointment--- the 2008 unsolved murder of UW student Brittany Zimmermann. Even though he’s leaving the department, Wray has hopes the killer will be found…

Zimmerman was a 21 year old UW student who was murdered in her downtown apartment in April of ’08.

The annual run in her honor supports the crimestoppers reward fund. It's tomorrow morning on the U.W. campus.

Wray's final day is Friday.