This is from the Pam's Club website. Hope it's OK to post.
"It is with a heavy heart that I announce the news of the deaths of Pam and Robert Bono on Sunday, September 21st. They were killed by a tragic accident, and our family is broken hearted in this horrible time. Many of you might want to know the circumstances of their death, but our family has decided to keep this private."
We can speculate but it seems we'll never know.