Based on the reporting so far, it sounds like there's a good chance that like a previous incident, legitimately prescribed pain medication may have played a part here. You'd think that under the circumstances, he'd have used some of his well-gotten gains to hire himself a chauffeur until he had fully recovered from his back surgery, but he probably underestimated how much the pain meds were impairing his driving ability.
Just to be clear, I'm not alleging or even suggesting he wasn't using pain medication as intended, just that he wasn't giving proper respect to its potential side effects. Taking pain medication wasn't his problem last time, it was driving while under the influence of legitimately prescribed pain medication. Last time he only suffered a DUI; this time it was worse, but thankfully no one else was harmed other than Nike stockholders.
I don't know the man's finances, but I do know a chauffeur is expensive.