they deserve more than a shotgun. make it last. make them suffer.
burn them in the depths of the nether, burn them in the acid of the ender dragon, drag them through the everlasting fire that is in netherrack, feed them to the zombies, and make them eat their dead dogs ashes with their bone soup. lastly, to kill them if they still live, end it with multiple slashes of a netherite sword with fire aspect. SLASH TILL THE SWORD DIES. if they somehow are still alive...TOSS EM OFF THE END.
that is just 1/100 of the pain needed to satisfy.