Police have identified the man who killed one in Casper College and another on Hawthorne Street before killing himself as Christopher Krumm, 25, of Vernon, Conn. He killed his father, James Krumm, with a bow-and-arrow in front of horrified students in the Wold Physical Science Center, where he was a computer science instructor. Christopher Krumm killed his father’s girlfriend, Heidi Arnold, 42, about two miles southwest of Casper College before killing his father. Christopher Krumm Christopher graduated from the University of Colorado in 2008. He was a student in the Department of Electrical and Computer Engineering.