No. I don't want my children and grandchildren associated by relation with a mass murderer. Furthermore, I wouldn't do that to any of my surviving relatives, since among them I have a reputation as a kind, gentle soul. Sure, I'll be dead so it won't matter to me, personally, but it will matter to them, and that's enough for me to reject the offer.
Basically what Bathorys said (except for the atheist part

)
'Course, let's assume for a moment that there's an afterlife. Let's also assume for a moment that it's similar to the afterlife I tentatively believe in (trust me, I'm going somewhere with this) wherein everyone ultimately ends up going to the same place, regardless of what's done in life. If that's the case, once people die, you can talk to them and easily clear things up, as you can ask the dead people thought to have been killed by you, and unless they're real snarky, they'll deny that I did it while pointing to the real killer.
But tentative or not, my belief in an afterlife no doubt raises the question: why, then, wouldn't I take the money even though I could do as I just said? My philosophy is this: whether there's an afterlife or not, it's better to live as if there weren't one. Better to live a single good life and entering oblivion more or less satisfied, rather than living 100 years suffering and then slowly drifting into eternal dreamless sleep with the one hope that there's more life after death (whether that be heaven or reincarnation/rebirth into a better life).
EDIT: BTW, potato, you say?
https://www.youtube.com/watch?v=wkoJD_ftq6Y