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do this on purpose. >> a dark house, a husband witho a gun. a wife dead on the floor. >> make sure that she is still breathing. >> oh, i don't think she is, damn it. >> there was no question who killed her. the mystery was why. >> i hear the door squeaking, and i hear the rumbling and i hear the dog growling. >> how could you not tell that's your wife?ld >> it was dark. >> he just kept saying it was an accident. he said he didn't do anything wrong. >> others disagreed.di >> we never for a second believe that he didn't know who that was standing in front of him. >> was it a tragic mis...

>> i need you to raise your right hand. >> reporter: and there was only one person who could tell that to the jury. coming up, a grieving husband? or a lying one? >> the love of your life? >> yes, sir. >> the person you know better than anybody else. >> yes, sir. >> and you can't tell it's her when you pull that trigger? then i heard a moaning. is a game changer. it's going to let the dentist offer their patient sensitivity relief in 3 days. say over the course of a weekend you're going to start feeling significant results. this is jamie. you're going to be seeing a lot more of him now. -i...

For. >> there was a brightness in her eye. >> i trusted that she knew her heart. >> they were in love. there's no other way around it. >> reporter: her life now complete, fulfilled, safe.

>> we never worried about her. >> reporter: but was it all an illusion? >> send an ambulance, please! >> reporter: what happened that morning, in the predawn hours, in the dark? >> right in the freaking chest! oh! >> reporter: the women at this san antonio racquet club say you can tell a lot about a person by the way they play tennis. >> i think tennis in general

>> she spent many, many hours traveling and many hours working overtime. >> reporter: but debbie hadn't found as much success in her personal life. she got married in her 20s, but it didn't work out. now in her 40s, and dedicated to her career, there was little time to look for the right guy. >> reporter: was it hard to date? >> it was hard for her to date. >> reporter: so in 2008 debbie took a new job that allowed her to focus a little more on her personal life. that's when she got serious about her tennis game.