Iran-Contra’s ‘Lost Chapter’

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6. Casey was scheduled to testify before Congress related to his knowledge of Iran-Contra...

William Joseph Casey (March 13, 1913 – May 6, 1987)

Hours before Casey was scheduled to testify before Congress related to his knowledge of Iran-Contra, he was reported to have been rendered incapable of speech, and was later hospitalized...

http://en.wikipedia.org/wiki/William_J._Casey

...Casey was due to appear before the HSCI on 16th December. The day before, CIA physician, Dr. Arvel Tharp went to visit Casey in his office. According to Tharp, while he was being examined, Casey suffered a seizure. He was taken to Georgetown University Hospital and was not able to appear before the HSCI. Tharp told Casey he had a brain tumor and that he would have to endure an operation. Casey was not keen and asked if he could have radio therapy instead. However, Tharp was insistent that he needed surgery.

Casey entered the operating room on 18th December. The tumor was removed but during the operation, brain cells were damaged and Casey lost his ability to speak...

http://www.spartacus.schoolnet.co.uk/JFKcaseyW.htm