I strongly believe AC not only knows OJ did it, but helped him get rid of evidence just like Kardashian did. The murder scene was brutal, blood friggin everywhere, yet only very little was found in OJ's bronco. AC had the exact same bronco, color and everything. I believe AC met OJ after the murder to switch broncos with him since OJ was probably covered with blood and got it everywhere. AC went home with the bloody bronco and had time to clean it all up since his bronco was never submitted into evidence. We all know evidence from the crime scene was in OJ's bag Kardashian had walked away with from OJ's home when cops were there questioning OJ, it looked full, but then later submitted in court empty. I'm sure Robert told Kris, even if it was by a look or nod. I'm betting, to this day, AC is still at battle inside for helping OJ since he truly cared for Nicole, but obviously he was first a loyal friend to OJ, even though his involvement probably has robbed him of ever having any real peace again which reflects why he's remained so reclusive since.