no
Presumably any superhero could if they had Kryptonite.
Kryptonite is a fictional element from the Superman comics that generally has detrimental effects on Superman and other beings from the planet Krypton.See link below for article about Kryptonite in all its forms.
no a lightsaber would not kill superman
Krypton was the element named after Superman's home planet.
Kryptonite robs Superman of his strength.
Krypton
Krypton
Superman must fly him to the air and punch him into space and let Wolverine lose his powers and let him die.
Magnesium
No.
superman killed badguys but not the inocent