Dennis Quinn appears in episode 381 as a nerdy and insecure friend of Marty Jackson who introduces him to his mother Meg Morris. Soon afterwards she starts to get phone calls by a threatening person. In the end it turns out to be Quinn who has called and also murdered at least two other people (a prostitute and a policeman). He attacks Meg but she survives. Morris doesn't seem to take it so hard as she soon gets back to work.