There's been some, and the most recent one I can think of is the trial of the Aurora, Colorado theatre shooter. You might remember the case a few years ago, of the man who went into the midnight screening of a movie with several assault weapons in Aurora, Colorado. I think his last name was Holmes.
There were a lot of media reports during his trial of jurors breaking down in tears while testimony was being presented of the pictures of people who were bleeding and had died. They were a necessary part of the trial, but were extremely hard for jurors to view. Many of them were interviewed after the trial ended and talked about just how difficult it was.