Gavin has grey eyes and short, black hair which is slicked back. He wears a grey suit with a white shirt, blue tie and a grey checked pocket handkerchief.
Prior to his death, he was shown to be immoral and selfish. He employed people to steal sensitive information about Hollywood's celebrities and use it to advance his own fame. Because of this, as stated by Dave Reyes, he had a lot of enemies.
Jessica was a hacker that stole sensitive information about Hollywood's celebrities to sell to Gavin. They had a falling out after he refused to pay her, which led the L.A.P.D. to believe she hired John Tull to kill him.