(DeCandido's novelizations of Anderson's Films)
When the T-virus escaped from The Hive and spread out into the city above, Halloran turned his store into a weapons cache and base for S.T.A.R.S., who had left the besieged Police Department building. He later let in the "usual street garbage" L.J. Wayne as a fellow survivor, equipping him with a shotgun.
When the Nemesis made its appearance, Halloran closed the store shutters for added protection. Identifying everyone but Halloran and Wayne as S.T.A.R.S. offices, it succeeded in killing only them. Halloran go up from behind the counter and fired back with his shotgun; identified as another threat, he was then killed.
While the character was listed in the film credits for Resident Evil: Apocalypse, he himself does not appear in the theatrical release.