traumatic encephalphy. players like mike webster, junior sao, and frank gifford diagnosed with cte after playing football with repeated blows to the head. >> our experience says somebody who plays football for 10 to 20 years, plus has severe personality changes mid life, including violence and impulse control, nearly every time we diagnosed them with cte. it is reasonable to think simpson has been suffering for a while. >> reporter: for many, that is not the excuse. criticism is coming from those closest to the crime. ron goldman's family telling dr. phil they feel the series takes attention away from the victims adding the filmmakers never contacted them. >> we have a whole new generation who never saw this take place and is now going to see this series and assume that everything in this series is fact. that's very troubling to me. >> reporter: the filmmakers did contact kris jenner.