July 25, 2011 5:50 am Man Died in Tubing Accident on Mission Bay A man died Sunday in a boating accident off Fiesta Island. Lifeguards said the man was riding an inner tube behind a boat when he fell off and his party was unable to find him. US & World Videos 0:35 Blue blobs washing up on San Diego beaches again 2:52 Poway Unified fires superintendent following investigation into bullying claims 0:34 5 people injured after falling from border fence 0:53 San Diego City Council Committee approves San Diego's next police chief 2:29 Family mourns 13-year-old killed in Escondido crash