Death and the Dentist - Encore
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(music) Thomas Coleman was in a vehicle in a parking lot of fitness plaza. The car was sitting here? Yes, actually this particular spot right in front of us. There was nothing in the car that would suggest anything of him being attacked or anything obvious of physical trauma. When I was told that my father died, everything I had ever known changed in a second. My dad was an amazing father to four kids and a great man. At first, we thought it was a heart attack, something natural, but sudden. After your autopsy, we knew something was wrong. Something happened to him. The doctor labeled it as acute medazolam poisoning. Poisoning? Yes. Medazolam, what is medazolam? That's a conscious sedative. It's used in hospital settings, also in dentist office who do oral surgery. There was no reason for it to be in his system. Is it like that that you change your mind and go this way? Right. Basically, yeah. We knew Cole's hand video on the corner of their building told him I need this video. Why don't you pull it up real quick? We'll take a look at it to see if there's any cars that meet him there. And sure enough, there's a car that pulls in of Park's first. He shuts the car down. This is Tom Coleman's car pulling in right there. It's 4.54 a.m. Our victim, Tom Coleman, pulls up side by side. That was basically, holy sh*t. Somebody had knowledge of literally speaking with our victim that morning. See the white SUV here leaving? We started thinking of the circle of people close to Tom Coleman and the only person with the white SUV was Gilbert Turnunez. They suspected Gil Nunez, who was my dad's best friend, who we had met, who we knew. It was shocking. It's emotional for you. Of course, very emotional. Because Tom was my best friend, truly. We had Nunez come meet us for an interview. I know Gillette would come back by a fitness early that morning. I know you were there. You know, I wasn't there. Probably I said it over a hundred times. I wasn't there. You gave him a drug that you have access to. Mr. Nunez, his profession was a dentist. Hello. I'm Dr. Gilberto Nunez. Besides treating my patients with dignity and doing everything I do for them, I just like to serve people, not to hurt anybody.
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In his only interview, a New York dentist charged with murdering his lover's husband vows that he didn't do it -- but could he go to prison for something else? "48 Hours" correspondent Richard Schlesinger investigates.