A former NFL player who shot and killed six people and then took his own life in April was suffering from a severe medical condition brought on by repeated head trauma, doctors announced Tuesday. Boston University neuropathologists said Phillip Adams had CTE — or chronic traumatic encephalopathy — a degenerative brain disease found in many former football players. "Phillip Adams had an extraordinary amount of CTE pathology in the frontal lobe, the area of the brain behind the forehead. Frontal lobe damage is associated with violent, impulsive or explosive behavior, a 'short fuse,' and lack of self-control," Dr. Ann McKee, director of the Boston University CTE Center, said in a statement . "His CTE pathology might have contributed to his abnormal behaviors, in addition to other physical, psychiatric and psychosocial factors," she added. The killings earlier this year shocked rural South Carolina and raised questions about the former cornerback's health. Authorities say on April 7, Adams