(DeCandido's novelizations of the Anderson films)
Margolin was an Umbrella employee who survived past the global T-virus pandemic in the company's Nevada base.
When Dr. Sam Isaacs disobeyed Chairman Wesker's orders not to go looking for Alice Abernathy, he brought Margolin along with him to assist in the operation. When Alice realised there was an Umbrella presence nearby, she ran up to a building rooftop and shot Margolin dead. Captain Alexander Slater intended to have Isaacs executed on part for causing Margolin's death, given the shortage of manpower.