I watched the trial, and there is no doubt he did it. It was an incredibly sloppy crime, and only his notoriety saved him from prison.
After he was acquitted, he used to regularly come into a small restaurant I frequented. He was always alone, sat off in the corner, and mumbled to himself the whole time he was there. You could tell the guilt had driven him crazy and the loss of his career and celebrity status had made him miserable.
The victim, Bonny Lee Bakley, was herself a real piece of work. She had a "business", if you can call it that, of lonely hearts scams and sham marriages. She also had a considerable arrest record for drugs, identity fraud, passing bad checks, etc. A real weirdo.
His defense team argued, successfully, that she was in the crosshairs of any number of men who she had conned or cheated in her past.