What is don mactavish autopsy report?

As an AI language model, I do not have access to actual autopsy reports. However, if you are talking about Don MacTavish who was a former NASCAR driver, he died in a racing accident on August 11, 1969, at the age of 34. It was reported that he suffered fatal head injuries when he lost control of his car during the Trans-Am race at the Wisconsin State Fairgrounds Speedway in Milwaukee. The accident resulted in new safety regulations being implemented in NASCAR, including the use of full-face helmets and door bars on the driver's side of the car.