MALVEAUX: Last Thursday, former Chicago Bears safety Dave Duerson killed himself with a gunshot wound to the chest. But before he took his life, he insisted that relatives donate his brain to be studied; researchers are looking into football-related head injuries. Our chief medical correspondent Dr. Sanjay Gupta spoke to Duerson's son this morning.</s>TREGG DUERSON, DAVID DUERSON'S SON: The police showed up at my door around 1:30, and I let them in and they told me my father died.</s>DR. SANJAY GUPTA, CNN CHIEF MEDICAL CORRESPONDENT: Again, I am so sorry to hear that and I know it's difficult to talk about. You talked about the fact that, you know, there were text messages, I mean, were you surprised? Was this a -- I mean, it's always a shock, but was there some indication to you that this could happen?</s>DUERSON: There was a text message the night before that was a bizarre text message that he sent to my mother saying that he loved her and he loved my family and that to please get his brain to the NFL Brain Bank. My mother called me at work, we talked about it. And it was a bizarre text, you can't make sense of it. So we were trying to reach out to him, trying to get in contact with him. No one could get in contact with him. And then, you know, when I'm getting up at 1:30 in the morning and I'm letting the police in, the first thing in my mind is, I think they're about to tell me my father died.</s>MALVEAUX: You can hear more of their discussion on "SANJAY GUPTA, MD" that is Saturday morning at 7:30 Eastern right here on CNN. Courageous rescuers and the search for survivors in New Zealand, that is what's trending online. We've got your tweets just up ahead.
Former Chicago Bears Safety Leaves Suicide Note: Study My Brain