Chronic Traumatic Encephalopathy isn’t just a football disease. Or a hockey disease. It’s now making headlines in baseball after researchers found signs of CTE in former major leaguer Ryan Freel.

Freel suffered 10 concussions during his eight years in the major leagues. He experienced classic CTE symptoms like depression, lack of impulse control, and substance abuse problems before committing suicide last December. He was 36 years old.

Former NFL players who showed signs of CTE and took their own lives include Andre Waters, Terry Long, and Junior Seau.