that they see as part of addressing a mental health crisis. kristen holmes. appreciate it. thank you. the family of louisville bank shooter connor surgeon says his brain will be tested for the neurodegenerative brain disease known as cte, a friend of the family tells cnn surgeon had a history of what has been described as significant concussions while playing sports in high school. they say his condition was so serious, in fact, that he eventually wear a helmet to protect his head. while playing basketball. the family says it was even known that classmates called him mr concussion, cnn's chief medical correspondent, dr sanjay gupta, joining us now so sanjay, we know you have done a lot of work here and a lot of reporting on c t e. what would we expect to find here? what should we know about this? well the idea of sort of drawing a cause and effect here between cte and this sort of this sort of behavior is a very challenging thing to do. as you might imagine. cte itself is something you know i've been working here 21 years when i