at 4:46, he woke up. at 4:54, his heart was beating well over 100 beats per minute, which is when he was attacked. the confrontation was over at 5:04 and david crawford laid bleeding until his heart stopped pumping at exactly 5:34 a.m. scientists retrieved this information with only hours to spare. >> it was about to be wiped. within an hour or maybe two hours, that information would disappear. >> and investigators discovered why crawford would have gotten out of bed. crawford's neighbor, who lived across the street, was in the hospital and had asked crawford to keep an eye on his house until he was released. >> everyone knew that he would be in hospital, and the neighbor was presumed to have money in his house as well. >> according to his son, he was that sort of person that if he heard a noise, he would get up and investigate the noise.