Wolverine has survived more assassination attempts than arguably any Marvel superhero. Thanks to his mutant healing factor and adamantium skeleton, Logan can come back from being shot, poisoned, burned, or even disemboweled. That being said, even this amazing power can’t save Wolverine from everything…
In the popular X-Men comic book storyline, "Days of Future Past," Wolverine suffers his most famous death – he gets incinerated by a blast from the hand of a Sentinel robot. The blast literally disintegrates the flesh from his bones, leaving behind only an adamantium skeleton and claws. As it turns out, this popular death scene is such an effective way of killing Wolverine that it’s been repeated many times across the Marvel multiverse.
In the back-up feature “Relics” which appears in Maestro #3, Rick explains this fact to his wife Marlo as they retrieve Wolverine’s adamantium skeleton from the war-torn streets of his post-apocalyptic world to display in Rick’s museum of superhero relics. Although Rick doesn’t live in the Days of Future Past timeline, he does have a way of viewing events from that alternate universe and many more parallel worlds, mentioning that he has also acquired a special orb formerly owned by Doctor Strange.
Thanks to the orb, Rick has been able to see Wolverine die in multiple universes, and believes Logan always perishes after the flesh is burned away from his corpse, leaving behind only an adamantium skeleton and claws. Rick admits that the exact circumstances do vary in different worlds – with some having Wolverine die in a Sentinel attack, others killing Logan off at the X-Men’s mansion, and even one destroying Logan at the White House – but the end result is the same, with Wolverine leaving behind his indestructible remains for posterity.
It’s a dubious claim, as multiple What If? comic books show Wolverine dying in different ways on alternate worlds (one, for instance, shows that after becoming a vampire, Logan recited a spell and disintegrated into dust). Likewise, Hugh Jackman’s Wolverine dies of multiple stab wounds and gets buried at the end of Logan (although one would suspect that the flesh from his body would eventually decompose and leave his skeleton), the Wolverine in Ultimatum is killed by Magneto, who weaponizes his adamantium to do the job, leaving behind only one hand (the one Wolverine had used to skewer the villain), and while the mainstream Wolverine has since recovered, he initially perished after being coated in adamantium.
Then again, considering all the times Logan has died and come back from whatever killed him, it’s possible that these deaths weren’t Wolverine’s true end, and he eventually came back to later die in the way Rick outlined. One comic book story actually shows that one alternate Wolverine got to survive his Days of Future Past end after an alien robot retrieved his skeleton and used some stray brain cells preserved in the skull to clone him back to life (with all of his memories intact). Being nearly disintegrated by a Sentinel blast certainly is Wolverine’s most well-known end, but for now we're skeptical about Rick's claim that it's the only one that puts him down for good.