I don't have the exact details, but this is what I gather from different conversations I've had:

He fainted while at Starbucks that morning, and woke up surrounded by paramedics. They wanted to take him into the hospital for further evaluation. He called Jeanne to tell her he felt fine and would call when he needed a ride home. He didn't call, so she went to the hospital anyway, and he was already gone. I can't even fathom how devastating that must have been for her.

Dave was troubled with heart issues going back several years. It seem things were pretty rough health-wise around Christmas time, and although he was rebounding ... in that last month looked better than he had in a couple years, he was scheduled to have an ICD put in at the end of June.

Jeanne's really struggling right now. I know she read this thread last week, and really appreciates all the kind things she read, and the photos too.