Salt Lake County chief prosecutor Sim Gill asked Monday that a murder charge and eight other felonies against 46-year-old Donald Eugene Younge be dropped.
Gill says there were evidence issues and other inconsistencies that came up as the case progressed.
Twenty-two-year-old Amy Quinton died after someone broke into a Salt Lake City apartment Aug. 3, 1999, and stabbed her and 19-year-old Erin Warn. The man had held three women in the apartment at knifepoint and stole their wallets.
Younge was sentenced to 31 years in prison in 2010 for the unrelated robbery and rape of another University of Utah student as she walked home from class in 1996.
(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)