Gil Everett is the drunk driver who almost killed Macey Irving in the accident that left her in a wheelchair.
In And the Abyss Gazes Back, Gil Everett appears as a patient in Tarrytown Psychiatric Hospital. Jeremy Crane suggested that Frank Irving could kill Gil, the motive being either revenge or to "redeem" his soul from War's control.
Gil did not appear to be truly sorry for hurting Macey, provoking Frank to assault him. Gil was saved from further injury when the hospital staff came to restrain Frank.