too quick a death. put him in a cell underground with only artificial light which is on 24/7. tie his arms. shatter his legs with a baseball bat. keep him there for weeks, letting him rot in his own piss and shit. toss his a crate full of live rats and maggots every now and then. he gets to eat what he's able to catch with his mouse but what survives will eventually eat him alive. then burn his remains and feed the bones to the pigs.
Germany