After the double-murder suicide, former wrestler Christopher Nowinski contacted Benoit's father, suggesting that years of trauma to his son's brain may have led to his actions. Tests were conducted on Benoit's brain by Julian Bailes, the head of neurosurgery at West Virginia University, and results showed that "Benoit's brain was so severely damaged it resembled the brain of an 85-year-old Alzheimer's patient." He was reported to have had an advanced form of dementia, similar to the brains of four retired NFL players who had suffered multiple concussions, sank into depression, and harmed themselves or others. Bailes and his colleagues concluded that repeated concussions can lead to dementia, which can contribute to severe behavioral problems.
Dr. Oswald tells of a dog that had been put into the loft of a barn by the sergeant of a cavalry regiment. Losing its balance, while in the door of the loft and barking, it fell, turning a few somersaults as it came down, and landed on the hard pavement, "with a crack that seemed to have broken every bone in his body." He says "blood was trickling from his mouth and nose when we picked him up, and the troopers advised me to 'put him out of his misery,' but he was my little brother's pet, and, after some hesitation, I decided to take him home in a basket and give the problem of his care the benefit of a fractional chance. Investigation proved that he had broken two legs and three ribs, and judging by the way he raised his head and gasped for air, every now and then, it seemed probable that his lungs had been injured."