Preston Okafor joins the Nebraska program from Omaha Westside High School, where he played for Coach Paul Limongi. Okafor helped Westside to back-to-back state championships in his final two seasons.

As a senior, Okafor helped the Warriors to a perfect 13-0 record by making 18 tackles while recovering four fumbles and breaking up three passes. Okafor was an honorable-mention all-state selection by both the Omaha World-Herald and Lincoln Journal Star, and he earned honorable-mention all-metro honors. As a junior, Okafor contributed on a defense that helped the Warriors to a 12-1 record and the Class A state title. 

In track, Okafor was a state qualifier in the 100 meters as a junior.