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>> reporter: anna valentine was in a state of disbelief when she learned that her close friend charlie tan -- had been arrested. >> did you have a chance to talk to charlie himself in that period? >> he called me on the phone, actually, from jail. so i talked to him a couple times. >> reporter: anna didnt sit around. she was going to do whatever she could to defend her friend. because she knew, there was no way charlie did anything wrong. >> you did something remarkable, anna, and that is you so...

Selfless. [ talking over each other ] >> yeah, he would do -- he would do anything for people. >> reporter: close friend anna had a hard time wrapping her head around charlie doing anything violent. the charlie she knew was a thoughtful kid who did things no ordinary teenager did. >> my mom went through, like, cancer, and he was always there. he brought her, like, gifts and stuff. so he was always there supporting anybody. >> reporter: so, anna too would be there supporting charlie through this ...

>> the odor of -- of decomposition was very strong. >> reporter: the detective now believed that emotional 911 call was bogus, a charade. >> did you say you heard a shot? >> yes. >> his mother was in peril. and he had to shoot the husband. but now youre seeing this might be days earlier. its a "whats going on here?" thing, right? >> correct. that first -- inference from the 911 call and from what charlie had said in the driveway to the deputies, seemed to be in -- you know, in -- confrontation w...

>> reporter: it was an upside down world in this courthouse. where youd routinely expect lots of supporters for the victim, there were none. >> there was no one who was mourning the victim. the victims assistant from the district attorneys office -- i sat with her the whole trial. because she had nothing to do. >> and apparently some people think that this vicious father, the victim, deserved -- got what was coming to him. >> oh, yeah. people that normally wouldnt advocate homicide -- who say, "...