I haven't heard about the 3rd suspect. Have they released any info on him/her?........
His name is Matthew Cloyd and there is info scattered around through the thread. It was his parents' SUV that was tracked to the unusual tires. LE found the tire dealer and contacted Cloyd's mom, who asked him about it.
He initially said he knew who did it and he was there. Then he fully confessed. He goes to UA-Birmingham now but transferred from BSC this semester or school year. His dad is a doctor. There's more about him on the thread, which I would misquote if I tried without looking.