During the last news conference, the Chief of the campus police said they spoke to the man who knew the deceased woman and was supposedly the “jilted lover”. He was not the person who killed all the people in Norris Hall. So unless there is more than one jilted lover, I don’t know what the motivation of the man who did all the shooting was.
I don’t think he said he was the jilted lover. Here is a quote from ABC:
Campus police have identified a person of interest who is not currently in police custody. Police say the person of interest is a male who knew the female who was killed in the original double homicide at the West Ambler Johnston Hall dormitory. Flinchum also said he is not a student and that he knew the female who was killed in the original double homicide.
http://abcnews.go.com/US/story?id=3045574