OWINGS MILLS, Md. -- Baltimore Ravens offensive lineman John Urschel, the NFL's mathematics expert, abruptly announced his retirement from football at the age of 26 on Thursday, just before the team's first full-team practice of training camp.
His decision, which was announced by the Ravens, comes two days after a medical study indicated that chronic traumatic encephalopathy, known as CTE, was found in 99 percent of deceased NFL players' brains that were donated to scientific research.
Urschel left the Ravens facility before practice without making a statement.