This is what I have found. I haven't found the link of when the father found the phone records. I know I have seen it but didn't bookmark it.
http://today.msnbc.msn.com/id/46805...arents-trust-friends-phone-call/#.T4kclNl0nWB
Though early on in the investigation police asked for anyone with information related to the shooting to come forward, Martin's friend did not — because she was highly emotional, Martin's mother told TODAY Wednesday.
“She is a 16-year-old teenager who just lost a friend very special to her,’’ Crump told Lauer. “Her parents are very concerned. They did not want her to get involved, and it wasn’t until Mr. Martin found the phone records and saw that she called him at 7:12. The police got on the scene at 7:17, and he was shot and dead on the ground.’’