Welp, this is going to be painful, but he already knows what comes after and he'll be spared the extra punishment if he had killed himself.
Come to think of it, he can probably be spared even the pain by screaming and being stabbed quickly in the neck. And it wouldn't be too hard, I think, to convince Death that it wasn't suicide by proxy because he was going to die anyway. Though she could argue he ought to try to live till the very last moment.
The serial killer removed his ankle monitor. I wonder whether that will play a role.