Hughes' death prompted a report by Australian Bar Association president David Curtain SC, who found the former Test batsman received appropriate medical attention in the 20 minutes and 10 seconds between being struck and an ambulance arriving.
The Curtain report also found the death would not have been prevented if Hughes had been wearing a British-standard helmet.
Hughes, who played 26 Tests and 25 one-day internationals, did not regain consciousness before his death.
At his funeral, then-Australian cricket captain Michael Clarke spoke about losing the friend he called "little brother".
"We must dig in, and get through to tea and we must play on," Clarke said.
"So rest in peace my little brother I will see you out in the middle."
- AAP