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Second interview, the day cathy's body was found. detective wyatt studied that tape, too. >> there was one thing that was important that sam didn't display that you would expect to see in a case like this. >> reporter: which is? >> emotion. he showed more emotion over the contents of a coke can. he picked it up when they left the room and reading the coke can and the ingredients and the number of calories. and at one point he puts that down and picks up a baseball hat he had been wearing, sees dirt and brushes it off and starts swearing about the fact that there's dirt on his hat. >> oh [ blee...

Cause when you're depressed you do things. >> remember, this interview happened while cathy was still missing. sam seemed to be implying she might have hurt herself or that another boyfriend might be involved. >> i mean, look, she, she's had, i know she's had a lot of problems in the past with boyfriends. >> reporter: then there was the second interview, the day cathy's body was found. detective wyatt studied that tape, too. >> there was one thing that was important that sam didn't display that you would expect to see in a case like this. >> reporter: which is? >> emotion. he showed more emoti...

>> remember, this interview happened while cathy was still missing. sam seemed to be implying she might have hurt herself or that another boyfriend might be involved. >> i mean, look, she, she's had, i know she's had a lot of problems in the past with boyfriends. >> reporter: then there was the second interview, the day cathy's body was found. detective wyatt studied that tape, too. >> there was one thing that was important that sam didn't display that you would expect to see in a case like this. >> reporter: which is? >> emotion. he showed more emotion over the contents of a coke can. he pick...

>> quite a few times looking for her. >> reporter: mary says sam sounded okay at first, until she told him where cathy was. >> i said she was at the hospital and she wasn't back yet. >> reporter: at the hospital, visiting albert, her boyfriend, who had attempted suicide. sam okay with that? >> no, he got upset. >> reporter: sam told police he was just worried about cathy, especially after he spoke with her that week. >> she was crying on the phone, i messed up you know, i never tried getting him hurt and all this and i told her just calm down. cause when you're depressed you do things. >> reme...

Second interview, the day cathy's body was found. detective wyatt studied that tape, too. >> there was one thing that was important that sam didn't display that you would expect to see in a case like this. >> reporter: which is? >> emotion. he showed more emotion over the contents of a coke can. he picked it up when they left the room and reading the coke can and the ingredients and the number of calories. and at one point he puts that down and picks up a baseball hat he had been wearing, sees dirt and brushes it off and starts swearing about the fact that there's dirt on his hat. >> oh [ blee...