Ellen didn't believed that Dorothy commited suicide. So she went to find out the truth herself, because the cops wouldn't do a thing because they believed she commited suicide. She didn't believed that story because she thought that Dorothy was at the point of getting married. She thought that Dorothy was killed by her boyfriend. So Ellen was trying to find that boyfriend. She didn't know a name but she knew that he was a blond and handsome guy who shared a class with hher. She found two suitable guys. Bat at that moment, she also found out that none of boyth boys did it. Because her own boyfriend Bud the killed Ellen herself. Before he killed her he told Ellen that he was the one who had killed Dorothy.