William Goggins, 43, of San Francisco, collapsed Sunday from apparent heart failure after crossing the 24-mile mark, the San Francisco Chronicle reported Monday. He was one of about 15,000 participants who ran to raise money for cancer research.
A doctor connected with the event said a spectator tried to revive Goggins and a medical crew reached him within moments. However, Goggins did not regain consciousness and was pronounced dead at a local hospital.
Goggins had been a deputy editor of Wired magazine.
Wired Editor Chris Anderson said: "Think of him as being the smartest, fastest, wittiest person you've ever met. That's Bill."
Sign language interpreter at Mandela service called out as fake on Twitter
Police: Sword-wielding man demanded free tacos