Did all the dead people who voted for Biden do so because Trump made them dead?

So, you're suggesting that EVERY SINGLE DEAD VOTE was for Biden.  I'd like to see your back-up information.

I did not say every. I said the Dems win the dead vote. I do not believe this year is any exception. 

Any proof that the Dems dead vote, but the GOP doesn't?

There is a strong possibility, even a probability, that more Dems voted by mail and died prior to the count. Not enough to affect the result. 
Why do my joke questions keep getting taken seriously?

LOL ... my response was to my2cents, not you.

Again I am not saying all or every.  

But in the areas where dead voters have been proven to be a problem they tend to be predominantly Dem. 
ie. LA

https://losangeles.cbslocal.com/2016/05/23/cbs2-investigation-uncovers-votes-being-cast-from-grave-year-after-year/

I'm thinking that such a position is not unlike the skeleton in your post---It attempts to be suggestive, but it is not an accurate representation of what we all know is the actual reality.