A serial killer stalks the L.A. singles scene

Angel Investigations' next mission finds them tracking a demon serial killer who preys on the city�s singles population. It's a burrower demon, a creature that possesses a host, finds its next prey then jumps to the new body - killing the previous host in the process.

During the investigation, Angel encounters undercover cop Kate Lockley. Kate, although sceptical of Angel�s vague credentials, becomes an essential source of information for the vampire. She�s pretty hot, too.

Quiz - ten quick questions.

Trivia: The episode originally intended to follow City Of was called Corrupt. Although Lonely Heart features many of the same ideas, Corrupt was a much darker tale - particularly in its depiction of Kate. The network suits wanted a slighter fluffier show, however, and the script was reworked.