it could be anyone. [ sirens ] >> on december 19th, 2011, benjamin gupta, a long mba student at georgeashington university died suddenly, mysteriously. he's no relationship to me, but when his family got word, they spent hours trading phone calls. they were in stunned disbelief. >> there was a message from his mom. and she had left three messages for me. so i knew there was something wrong. and i called her back, and i said, "what happened?" and she says, "it's ben. he died." i didn't have any information. >> i finally said, "how did this happen?" and she said he went to sleep the night before, and he just never woke up. >> he's always smiling, you know, in every picture. >> for days, ben gupta's family was desperate for answers. what killed him? he was only 28 years old. he had recently been given a clean bill of health. how could he just not wake up? >> and then the thought went through my mind that maybe it was some sort of brain aneurysm or something must have happened. >> but his father was in for a shock after a conversation with a doctor who performed ben's autopsy. >> he called

. >>> on december 19, 2011, benjamin gupta, a law and mba student at george washington university, died suddenly. mysteriously. he's no relationship to me, but when his family got word, they spent hours trading phone calls. they were in stunned disbelief. >> there was a message from his mom, and she had left three messages for me so i knew there was something wrong. >> i received a call from my mom. i didn't answer, but then i got a text message from her, which is very unusual. >> and i called her back. and i said, what happened? and she says, it's ben. he died. i just -- i didn't have any of the information. >> i finally said, how did this happen? and she said he went to sleep the night before and he just never woke up. >> he's always smiling, every picture he's smiling. >> for days, ben gupta's family was desperate for answers. what killed him? he was only 28 years old. he had recently been given a clean bill of health. how could he just not wake up? >> and then the thought went through my mind that maybe it was some sort of a brain aneurism or something must have happened. >> but his