"Cortez is a player that is familiar with the system run by Mike Stoops and Tim Kish from their time together at Arizona," said OU head coach Bob Stoops. "He's got good size for a corner and we feel that he's the type of player that can provide strength in our defensive scheme."
He recorded a career-high seven tackles in that contest against Washington.
In his lone season with the Wildcats, he played in eight games overall.
The 6-foot-2, 196-pound cornerback arrived at Arizona as a two-star prospect out of O. Perry Walker School in New Orleans, La., where he was named to the 2010 Louisiana Sports Writers Association All-State Team after his senior season.
He also earned New Orleans Times-Picayune All-Metro Team honors and played in the Darren Sharper Lake Pontchartrain All-Star Classic.
Johnson, like fellow incoming transfer receiver Jalen Saunders, must sit out the 2012 season due to NCAA transfer rules but will be eligible as a redshirt sophomore in 2013.