Robwin posted a link to CNN’s Grand Jury Docs, and Witness number 63 is Dr. Baden (private autopsy). His interview is interesting (FBI interview).
https://www.documentcloud.org/documents/1370925-fed-int-witness-63.html
From reading some of the witnesses testimony, and Dr. Baden’s, people that KNEW they were going to be witnesses and testify, IMHO, shouldn’t have been reading/watching/listening to/discusses MEDIA hearsay reports to substantiate their findings (Dr. Baden) or use those media reports to enhance their own testimony.