Russian officials and media had accused Mr Voloshyn of flying the jet which shot down the Boeing 777 passenger plane, killing all 298 people on board.
However, a two-year Dutch investigation concluded the plane had been destroyed by a Russian Buk missile.
Investigators released footage showing the missile system, originally carrying four missiles, being transported from Russia by rebels.
Several tapped phone calls featured men's voices discussing the transport of the Buk missile system from and then back to Russia.
Audio previously released by Ukranian officials appears to show a panicked militant saying MH17 was shot down in the mistaken belief it was a military plane.
"It was 100 per cent a passenger aircraft," he tells a superior. "There are civilian items, medicinal stuff, towels, toilet paper."
Hours after the passenger plane was shot down, the Buk was seen being driven back towards the Russian border minus one of its four missiles, before the convoy left Ukraine overnight.
Police in Ukraine described Mr Voloshyn's death as suicide, but said it was being investigated under the premeditated murder section of the country's criminal code.
The 29-year-old had been working as the director of the local Mykolaiv airport after retiring from the airforce.
He had flown 33 combat missions in an Su-25 during the ongoing war between Ukraine and Russian-backed rebels.
The Kremlin continues to deny a Russian Buk missile was used to shoot down MH17.
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