Well everyone dies.

If you mean, "died while freesoloing", you've got,

* Derek Hersey * John Bachar

off the top of my head. There are others,

https://en.wikipedia.org/wiki/Free_solo_climbing#Notable_acc...

Dan Osman died from a roped fall (jumped with the intent of the rope system to slow his fall), not a free solo. Dean Potter died from a wingsuit accident, which "literally" is probably the most dangerous hobby.

https://en.wikipedia.org/wiki/List_of_fatalities_due_to_wing...

"72 percent of fliers had witnessed death or serious injury, and 76 percent had experienced what they categorized as a “near miss.” http://www.newsweek.com/2014/09/12/thrilling-deadly-world-wi...

Dean Potter on Heaven, https://www.youtube.com/watch?v=wRUkolahw58

The late, great Patrick Edlinger survived a terrible fall before retiring, only to fall into depression.

Many die. Are you surprised from watching the videos that it's dangerous?

https://en.wikipedia.org/wiki/Free_solo_climbing#Notable_acc...

One of my favorite climbers and free soloists, Dan Osman, also died in an accident but not while free soloing. He was doing a 1000 ft rope jump (jumping from a cliff while connected to a climbing rope and catching oneself while trying not to slam back into the cliff face) when his rope snapped.

Here's two videos of him doing a rope jump and of him free soloing:

https://www.youtube.com/watch?v=EilwLq7w1bs

https://www.youtube.com/watch?v=wYbwZQ-QnMY (note the "dyno" at 1:09)

The American Alpine Club gathers reports and publishes Accidents in North American Mountaineering [1] annually. That's probably the best source. I've been climbing for thirty odd years and recall very few deaths free soloing.

[1]: http://publications.americanalpineclub.org