According to blogger Tim Killian's research, the Republican candidate for president passed about seven years ago, but, still, no death certificate exists:

I went to the Mormon church owned familysearch.org. There’s no records of Willard Mitt Romney there at all! It’s all been scrubbed! So, while I’m not naive enough to present the conspiracy that Mr. Romney NEVER existed, I do wonder WHAT the LDS Church is hiding! Mr. Romney, just produce your death certificate!

The death certificate surely exists somewhere, right, so why not just show it? Unless—let's just think here—Romney died in Mexico. Or those funeral receipts were obvious fakes! Or his name wasn't actually Mitt but Mittler...