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

Question: what else did he have to do with the assissination
Self-contained rewrite: what else did Harry Reasoner  have to do with the assissination of John F. Kennedy?