Former NFL player accused of killing six people was suffering from severe CTE

• Phillip Adams apparently shot six dead before taking own life
• CTE linked to concussions and can cause aggression and paranoia

A coroner says an autopsy shows unusually severe brain disease in the frontal lobe of the former NFL player accused of fatally shooting six people in Rock Hill, South Carolina, before killing himself in April.

The 20 years that Phillip Adams spent playing football in high school, college and the NFL definitely ... gave rise" to a diagnosis of stage 2 chronic traumatic encephalopathy (CTE), said Dr Ann McKee, who examined Adams' brain.