No

How will he do it after the fact?

No. I'm not going to Hell for 10 million dollars.

I would require it to be paid upfront

I’d take the 10 million and just give him sleeping pills so he actually doesn’t die

If he had that much money he could go to the dignitas clinic in Geneva and die in relative luxury

Yes

Sure! My weapon will be time.

Nope. Can't take a dead man to court for payment. I'd have to have 50% up front. Then I'd hire a hooker and let him leave here with a smile.