According to a Marcus Sanders story on Surfline:
San Francisco surfer Adrian Ruiz, 26, was attacked and killed by a shark while surfing at Troncones in Mainland Mexico on Monday afternoon. . . According to local paper Despertar de la Costa, the shark bit him on the right thigh, left a 15-inch wound, and he died from blood loss. He was about 300 yards offshore when attacked, and the situation was aggravated by a lack of emergency services at the beach.
[Link: Surfline.com]