Det Supt Fulcher said he wanted to "appeal to the killer's conscience" but Mrs Justice Cox said the move was "designed to persuade the defendant to speak".
Part of an online society called The Older Gamers that has 57, 000 members world-wide, he shreds competitors in the online shooting game Battlefield 3 under the alias Claw a reference to the signature move of a 1950s-era pro wrestler, Killer Kowalski.