I also am very shocked and saddened by this tragedy. What a grief to the wife and mother! While we have never met face to face, I spoke with Drew one time several years ago on the phone and was impressed by his down to earth manner and knowledge. I like many, have a 17 year old son, and what Drew and Brent were doing sounds a lot like myself and my son.
Since they went for a picture, I hope they recover(ed) the camera. It would almost surely be a digital model and the last frames might reveal some important clues.
To Irene and family and friends, my deepest sympathy in your time of deepest loss.
Duty is ours, the results are God's - John Quincy Adams