According to ABC news a brain scan was performed on Benoit's brain by a neurologist. It was found that due to so many head concussions that Benoit had frontal lobe damage.
Frontal Lobe Syndrome causes emotional and social withdrawal, outbursts of rage and violent behavior. In the biggest development in the Benoit family tragedy story since the toxicology reports came back, ABCnews.com has reported that according to tests on Chris Benoit's brain conducted by Julian Bailes of the Sports Legacy Institute (former WWE wrestler Chris Nowinski is the president of this organization), "Benoit's brain was so severely damaged it resembled the brain of an 85-year-old Alzheimer's patient." The story goes on to say that "Bailes and his research team say that this damage was the result of a lifetime of chronic concussions and head trauma suffered while Benoit was in the wrestling ring."