Authorities say beaches in San Diego County that were closed after a deadly shark attack will reopen Monday. At least eight miles of sea front were closed to swimmers over the weekend after Friday's attack. Retired veterinarian David Martin died after he was bitten in the legs by a shark thought to have been a great white. There has been no sign of the shark since the attack on the 66-year-old triathlete. It was the first such attack in San Diego County since 1994.