Well, the REAL killer saw that OJ was hunting for Nicole’s killer out on every golf course he could find (Ha, kinda like Obama does all the time), so he took advantage of the opportunity and buried the evidence to incrimination poor OJ.
Furthermore, the REAL killer was almost certainly a white man who was trying to frame OJ for being uppity, and speaking truth to power or something. Just another case of Da Man holdin' a brutha down.
Well, to give OJ credit, he finally did put the real killer behind bars.