(Covers information from the S.D. Perry novels)
Jill Valentine was a S.T.A.R.S. officer for the Raccoon City branch in 1998, later becoming an anti-Umbrella activist.
Jill was the daughter of a professional thief named Dick Valentine; she was his accomplice and protege. During her shadowing of her father, she developed unrivalled infiltration skils and expertise at lockpicking. After her father was arrested, she decided to turn a new leaf and become a police officer, eventually becoming a member of the S.T.A.R.S. Raccoon branch's elite Alpha team.
Arklay Mountains investigation
When the t-Virus began to spread around the Arklay Mountains, Jill was hit hard by the cannibalistic murders early on when Becky and Priscilla McGee, two young children that Jill had recently befriended, were found dead in the forest. Taking part in the investigation, Jill initially theorized that their deaths -and the deaths of several others- were part of a string of ritualistic murders by a cult operating in the mountains, though retracted it due to evidence on the contrary.