Conversation so far:
what does Harry Reasoner have to do with the assassination?
Harry Reasoner took part in covering the John F. Kennedy assassination
what was Harry Reasoner part in the cover of the John F. Kennedy assassination?
Harry Reasoner took over the anchor chair after Collingwood tossed it to him at 5:49 p.m. EST and opened with the repeat of an announcement by Frank Stanton
what else did Harry Reasoner  have to do with the assissination of John F. Kennedy?
Harry Reasoner reported on the arrival of President Kennedy's body in Washington, D.C., and provided details regarding Lee Harvey Oswald
who is lee harvey oswald harry reasoner reported details of?
Lee Harvey Oswald assassinated United States President John F. Kennedy
what else did Harry reasoner cover up besides reporting Lee Harvey Oswald?
Harry Reasoner also anchored the final coverage of the next day, with a CBS News special, titled A Day to Mourn.“
did Harry reasoner have critics?
did Harry Reasoner receive any awards?
Harry Reasoner won three Emmy Awards and a George Foster Peabody Award

Question: what was his biggest contribution to the assassination
Self-contained rewrite: what was Harry Reasoner biggest contribution to the assassination of John F. Kennedy?