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>> she was a design original. christina. the fashionista. >> fantastic wardrobe. >> she went out to drink with friends and never came home. >> i sensed something was wrong. >> this is real. >> who was the last to see her? >> she went her way? that's all i can tell you. >> where was her ex-model boyfriend? >> he doesn't call when she's missing. >> someone had something to hide. >> he thought he was getting away with it. >> she was fighting for her life. >> all i can do is pray with all that i have. tell me what happened that night. welcome to "dateline." 23-year-old christina morris h...

Grocery store with a gas station attached to it. >> this video from the gas pumps shows enrique filling up his camaro. >> and while he was getting gas, he washes the back of his car where the trunk is at. >> okay, he's washing the back of his car. he's a car guy. >> it's a bit odd. it's the -- the squeegee you would use on your windshield. and he's washing the trunk area where the license plate's at. >> remember, police had already searched the interior of enrique's camaro. now, they thought he might inadvertently be pointing them in a new direction. police obtained a search warrant, and broug...

But about ten minutes later, christina's phone pinged off a tower back near the shopping mall and then so did enrique's, almost as if they'd made a u-turn. >> and i think something changed. i think maybe he put the moves on her and started making sexual advances towards her and she was not okay with that. >> and then maybe is when the altercation began. >> detectives testified they'd seen injuries on enrique's arms and hands. >> because as detective busby said, there was a fight. it was between enrique and christina and she was fighting for her life. >> then, he told the jury, christina's cell...

Now, they thought he might inadvertently be pointing them in a new direction. police obtained a search warrant, and brought the car down to the crime lab garage. and they showed that gas station video to the csi techs. >> and one of the c.s.i. investigators thought to herself -- where is a likely place that would have d.n.a., that's hard to clean, and she said that her gut told her to swab the weather stripping, the rubber portion of the trunk at the seal. >> it's that black rubber gasket that lines the opening of the trunk. >> they swab it, and send it off to the laboratory for confirmatory t...

And hands. >> because as detective busby said, there was a fight. it was between enrique and christina and she was fighting for her life. >> then, he told the jury, christina's cell phone went completely dead. enrique's phone continued to ping, eventually near his house about 35 minutes later. finally, the state presented its strongest evidence. csi techs testified they did find christina's dna, a lot of it, in that rubber gasket lining the trunk of enrique's camaro. what they found was probably blood, said experts, but they weren't 100% sure. they were sure that it belonged to christina. and ...