as an investigator, when you look at that video, what are the clues you see that can help you solve a murder? >> well, chris, what i see there is, clearly, mr. wheeler suffered a neurological event. no question about that. you have to ask yourself, what was that event? did someone introduce something into his system? some type of agent or medication or did he suffer a medical condition, a stroke or maybe a mini stroke or was he the victim of an assault and/or robbery. >> one of the first questions you want answered is what does the toxicology report tell us. >> toxicology is crucial in this case. >> security guard interviewed by the newspaper said wheeler was at a parking garage where he had been searching for his car. he apparently told this garage attendant he had been robbed of his briefcase and she said his speech was not slurred and she didn't notice any odor of alcohol and his eyes were red