The Death of Frank Olson

On November 28th 1953, CIA scientist Dr. Frank Olson plunged to his death out of a 13th floor hotel window. The death was initially ruled a suicide until 1994 when a second autopsy was performed. Was Frank distraught over what he was apart of in the CIA or had he become a security risk that had to be taken care of? I'll give you the facts and you decide.