...if I were innocent, I would NOT calmly sit for hours while being interrogated.
I'll play devil's advocate for a moment...
If I were innocent, then I would be more calm than if I was guilty and being interrogated. I'd have nothing to hide or fear, knowing that when they got their shit together, they would hopefully eliminate me as a suspect (but more on that later).
Then again (devil's devils advocate, I guess), a sociopath would probably be calm even if was guilty.
I didn't see 20/20 and didn't keep up with the court case to form an opinion on guilt/innocence. I've known someone wrongfully convicted on circumstantial evidence (later exonerated) so I'm careful to having a knee jerk reaction presuming guilt. The fact is, the jury found him guilty so in the eyes of the law he is guilty, unless his appeals process reveals evidence proving his innocence.
On a side note, it amazes me how many people allow themselves to be interrogated by the cops without a lawyer present. It ain't just a TV slogan, you do have the right to remain silent. Guilty or innocent, I ain't saying shit till my attorney is present. Too many innocent people in prison for me to trust the cops and DA who are under pressure to bring someone to justice as quickly as possible.