Someone knows who killed UW-Madison student Brittany Zimmermann in her West Doty Street apartment two years ago. That belief – held by members of Zimmermannâ??s family since she was slain April 2, 2008, in the middle of the day on a normally bustling street – is shared by detectives still trying to find her killer, said Madison police spokesman Joel DeSpain. But no one has come forward with that information, prompting renewed pleas by Zimmermannâ??s parents for contributions to a reward fund.
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