and it just it hit me like i got punched in the face, was there was arterial spurt on the sidewall of the trunk panel. reporter: meaning only one thing cathy was still alive when she was placed in the trunk of the car. so, if xavier put her there, he could be charged with murder. why not grab xavier up that day and say, okay, your dna and fingerprints were at the scene. we didn t know that until just now. you re going away for murder unless you start talking. ? well, let s say that we did that and we bring him in and he says, well, yes, my fingerprint was there because i helped her push her car out of the street a week before. or when i was helping her change a tire. i cut my finger and i bled on it. reporter: so instead of approaching xavier, daron wyatt spent nearly five months carefully watching him and sam. he learned the two cousins were unusually close. sam lived in a one-bedroom little bungalow with his wife and his baby at the time, yet xavier was there all the t
and it just it hit me like i got punched in the face, was there was arterial spurt on the sidewall of the trunk panel. reporter: meaning only one thing cathy was still alive when she was placed in the trunk of the car. so, if javier put her there, he could be charged with murder. why not grab javier up that day and say, okay, your dna and fingerprints were at the scene. we didn t know that until just now. you re going away for murder unless you start talking ? well, let s say that we did that and we bring him in and he says, well, yes, my fingerprint was there because i helped her push her car out of the street a week before. or when i was helping her change a tire. i cut my finger and i bled on it. reporter: so instead of approaching javier, daron wyatt spent nearly five months carefully watching him and sam. he learned the two cousins were unusually close. sam lived in a one-bedroom little bungalow with his wife and his baby at the time, yet
his hair, his blood. but they hadn t sent anything related to javier lopez to the crime lab. reporter: daron sent javier s samples, now three years old, to the crime lab. two months later, the phone rang. they had positively identified a fingerprint on the trunk of cathy s car, left there by somebody closing the lid of the trunk. reporter: javier s print was on the trunk of cathy s car? yes. reporter: weeks later, another call from the lab. a bloodstain on the car had tested positive for both cathy s dna and javier s. and the detective found there was something else another major piece of evidence investigators had initially overlooked. when you look at the crime scene photos in the trunk of the car, something jumped out at me. and it just it hit me like i got punched in the face, was there was arterial spurt on the sidewall of the trunk panel. reporter: meaning only one