Sure, maybe he was murdered, but that would take a conspiracy of dozens — if not hundreds — of people cooperating without even one breaching their “operational security” in any way.
Because the injuries are consistent with suicide, the Coroner’s report carries the day, and those who believe otherwise are left with their assumptions and suspicions which, as everyone knows, do not count as evidence.
Unless these people are fully prepared to challenge the official findings in court, then it might be better for them to pick a battle they can win instead.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.