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Four hour period of the murder, five or six different names. and one of those came back to garrett kopp. >> reporter: who were they talking to? >> on the 22nd there was probably, i want to say maybe, 13 phone calls, if memory serves me right. they were made between garrett kopp and chris sutton's phone calls. >> a lot of calls. >> reporter: lots of calls. on the day of the murder. quite probably meant nothing at all, of course. still. garrett kopp was 20. a visitor around the sutton house. didn't seem to hatch a job or any direction in life. but christopher saw some good in him apparently. hir...

>> reporter: given what they had against kopp, detectives gambled the shooter may roll over on the son. >> reporter: he denied all. wasn't my gun? >> it wasn't my gun. looks like we'll beep here a long time today. >> reporter: and they were. hours and hours. >> do you know how the house was set up. i said i don't believe you did this on your own. give me the reason as to how chris got you to do this? >> heap basically said look, you have to look out for me and my family because i am afraid of him. >> reporter: chris is going to kill him. >> if he didn't do this. >> reporter: having given himse...

To the sutton house. so, as detectives eliminated early suspects like montodo. they went back to the basics of every homicide investigation. >> everyone is somewhat a suspect. you know you start with the family. and you keep working your way out. >> reporter: family. john and susan met on a blind date, were married a year later. from the beginning, made family a very big deal. but even though they were strikingly good looking and financially successful and happy, they were stymied. no matter how they tried, and oh, how they tried, they could not have children. >> she was sure that as much as a...

>> reporter: here was the man on the end of the phone. the man who said heap did it. garrett kopp. 25 years old. short, scruffy. the self-confessed killer shuffled into the courtroom and told a horrifying tale how christopher instructed him to enter the house through a sliding glass door near the pool. how he made a sketch of the house to guide garrett down a hallway that john to john and susan's bed rooms. >> what did you do at the end of the hallway? >> proceed to shoot. >> who did you shoot at first? >> john. >> mr. sutton? >> yes. >> where was mr. sutton when you shot at him initially? >> ...

Said there was a murder/suicide down in coral gables. we heard that the husband was en route to the trauma center. and in critical condition. >> reporter: en route with two bullet wounds to his head. had sutton killed his wife and turned the gun on himself. no, that theory was quickly dismissed when the paramedic put out a report. >> he can't provide any info. >> he had wounds to his hands which would make it clear like it was defense type wounds that somebody else must have shot him. he put his hands up. >> reporter: obviously. first clue. >> this is not murder/suicide. >> reporter: who or wh...