Kate Lockley was a detective for the Los Angeles Police Department. She first met Angel when working on a serial killer case at a single’s bar. The two made a connection, Kate came to trust Angel and the two aided each other in different cases. Kate began to find herself attracted to the enigmatic Angel, even though she wouldn’t admit it, even to herself.

Kate discovered that Angel was a vampire, something which truly confused her, made more difficult by the dicovery of her father’s lifeless body - killed at the hands of vampires. Kate read up on Angels evil past and threw her hatred and frustration at him every time they met.

Obsessed with ridding the city of “his kind”, Kate began to concentrate on cases connected with the supernatural, forcing her career to spiral downwards until she was fired. In despair, Kate attempted to take her own life by washing down prescription pills with alcohol. During this she called Angel and blames him for ruining her life because he made her believe. Angel broke into her apartment and saved her life, and trhe two came to an understanding. Kate told Angel she believed there’s a higher power at work and they’re not in the battle against the forces of darkness alone. When he asks her why, Kate replies that she never invited him into her apartment.