SAN FRANCISCO (AP) ― The last minutes of a 17-year-old boy's life were spent trying to save his friend from the tiger that was mauling him at the San Francisco Zoo, only to have the animal turn on him, police and family members said. Carlos Sousa Jr. and his friend's brother desperately tried to distract the 350-pound Siberian tiger, but the big cat instead came after Sousa. "He didn't run. He tried to help his friend, and it was him who ended up getting it the worst," the teen's father, Carlos Sousa Sr., said Thursday after meeting with police. The heroic portrait of Sousa and a timeline of the dramatic Christmas Day attack emerged as officials revealed that the tiger's escape from its enclosure may have been aided by walls that were well below the height recommended by the accrediting agency for the nation's zoos. San Francisco Zoo Director Manuel A. Mollinedo acknowledged that the wall around the animal's pen was just 12 feet high, after previously saying it was 18...