Brown is the fourth Penn State player to announce his retirement in the month of August.
No update on the injury was provided at photo day, but Stevens tweeted "Don’t Panic! ??" on Saturday afternoon.
Penn State's defensive line rotation will be shaken up following Ryan Buchholz's medical retirement from football, while the coaching staff is letting the linebackers duel it out during camp.
The team will hold an informational meeting on August 22 at 6 p.m. in the Lasch Building for students interested in trying out for the team.
The freshman announced that he was diagnosed with a heart problem that will end his college football career.
Buchholz said his problems developed in high school and led to years of him dealing with extreme pain and multiple back surgeries.