Thomas Crooks' body be cremated before anyone can look. Remember when government "lost" JFK's brain

Remember when the government "lost" JFK's brain because it would have proven that there were multiple shooters and now the government just let Thomas Crooks' body be cremated before anyone can look at it.
What would Thomas Crooks' body have proven that they don't want us to see?
That's what I'm wondering.
Was he on drugs of some kind?
Was he shot from an angle they don't want us to know about?
What are they hiding?