Dig a deep hole, build a big bonfire in it, once the fire is burned out, and all that remains is ashes, surround the hole with people for him to murder. When he comes over to murder the people run up behind him, and kick him in the ash hole.

With sufficiently deep ashes (like up to his waist), after allowing him to thrash around for a bit down there, he'll be covered in ash, which will help the steel stick to him. The molten steel will cover his top, but the ashes will prevent him from climbing on top of it. The first layer should be around a foot or so thick, and once it's hardened, you should have encased him fairly well up to the hip. After that it's a matter of doing that a layer at a time so he can't somehow swim up through the molten steel if too much is added at once. Once he's fully encased up to his hip over the head, you can either leave him there, and hope humanity has left by the time it breaks down, or you know, toss him into jupiter like a previous answer said.

Dig a deep hole, build a big bonfire in it, once the fire is burned out, and all that remains is ashes, surround the hole with people for him to murder. When he comes over to murder the people run up behind him, and kick him in the ash hole.

With sufficiently deep ashes (like up to his waist), after allowing him to thrash around for a bit down there, he'll be covered in ash, which will help the steel stick to him. Then you dump molten steel on him, the molten steel will cover his top, but the ashes will prevent him from climbing on top of it. The first layer should be around a foot or so thick, and once it's hardened, you should have encased him fairly well up to the hip. After that it's a matter of doing that a layer at a time so he can't somehow swim up through the molten steel if too much is added at once. Once he's fully encased up to his hip over the head, you can either leave him there, and hope humanity has left by the time it breaks down, or you know, toss him into jupiter like a previous answer said.

Dig a deep hole, build a big bonfire in it, once the fire is burned out, and all that remains is ashes, surround the hole with people for him to murder. When he comes over to murder the people run up behind him, and kick him in the ash hole.

Dig a deep hole, build a big bonfire in it, once the fire is burned out, and all that remains is ashes, surround the hole with people for him to murder. When he comes over to murder the people run up behind him, and kick him in the ash hole.

With sufficiently deep ashes (like up to his waist), after allowing him to thrash around for a bit down there, he'll be covered in ash, which will help the steel stick to him. The molten steel will cover his top, but the ashes will prevent him from climbing on top of it. The first layer should be around a foot or so thick, and once it's hardened, you should have encased him fairly well up to the hip. After that it's a matter of doing that a layer at a time so he can't somehow swim up through the molten steel if too much is added at once. Once he's fully encased up to his hip over the head, you can either leave him there, and hope humanity has left by the time it breaks down, or you know, toss him into jupiter like a previous answer said.