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Crime scene tape surrounds he home of Casper College professors Jim Krumm and Heidi Arnold on Saturday, Dec. 1, 2012 in Casper, Wyo. The couple were killed by Krumm's 25-year-old son Chris Krumm on Friday morning. Arnold died from knife wounds on the street in front of the house, after which Chris Krumm killed his father and himself in a Casper College classroom. (AP Photo/The Casper Star-Tribune, Alan Rogers) MANDATORY CREDIT; TRIB.COM