I would greatly appreciate a lawyer weighing in on this question. For me, I try to take things in order. Because of how things unfolded, they arrested him before he had a lawyer, and before they interviewed him at all, so he never had a chance to provide an alibi that might have quietly redirected their investigation. If they have the wrong guy, it's going to be messy all the way around. 100%.
I'm also assuming AT met with BK before the hearing that day, even if for just a few minutes. If I were arrested for a murder I didn't do and had an alibi, the first words out of my mouth to my lawyer would be "For the love of God, I didn't do this. I have an alibi. Please help me!". If he gave her an unshakable alibi, I can't see AT saying "Great, that will really torpedo their case when we get into court in three years. Sit tight now." To me, she has an obligation to go to LE and say "I have something to check out and it's in everyone's best interests to give me a few hours before we all go into court on camera." If it checks out, I think they have to release him.
Now, if LE uncovered information on their own (after he's arrested) that points to someone else being responsible? I think that's the stuff that gives LE nightmares. If they are honorable and good at their jobs, I think they chase that down like crazy. And if it checks out, they have to release him. It would be discoverable, right? If they let him rot in jail with evidence in hand that excludes him as a suspect, he eventually sues everyone's butts off. I certainly would in his situation.
Every lawyer on here may show up and tell me I'm an idiot, but that's what I think.
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MOOooo