the only way to kill him is to rip his adamantium skeleton out of his body which is how hes killed in the comics, but other than that there is no way to kill him, sure u could say cut his head but how would u cut threw the adimantium???
i would say drown him or what... it wouldn't be pure death, cuz if ye would get him outta the water he would live, but leave him in the water until he's rotten, so he won't have any flesh to recover, hehe
uhm... i dunnow if someone already said this but well... remember lady deathstrike?? shes got the same powers like wolverine... and how did wolverine kill her?? he filled her body with adamantium..... (well.. rumors say that deathstrike will be back in x3 so... im not so sure)
the easiest way i can think of is to exanguinate him, keep his aorta open. according weapon x, wolvie would eventually start to heal over any aparatas holding his skin apart but if a long enough tube is used, he will die before he is able to heal.
__________________ Land of the free, home of the brave...
Do you think we will ever be saved?
In this land of dreams find myself sober...
Wonder when will it'll all be over...
Living in a void when the void grows colder...
Wonder when it'll all be over?
Will you be laughing when it's over?