Police were called to assist after the kangaroo prevented the ambulance crew from accessing the injured man, who died at the scene.
The man is believed to have been attacked by the kangaroo earlier in the day.
A police report will be prepared for the coroner.
Are fatal kangaroo attacks frequent?
Associate Professor Graeme Coulson from Melbourne University, who studies kangaroo behaviour, said despite attacks being rare the incident was a reminder these are “wild animals” and people should act with care around them.
Grey kangaroos at the Belconnen Naval Transmission Station near Canberra, Australia. Source: AP / Mark Graham
“Remember that they are wild animals – they are not pets – remember that they have got sharp teeth and claws,” he said.
“It does happen [attacks] from time to time – [but] fatal incidences are extremely rare.”
“All they want to do is fight with other male kangaroos.
William Cruickshank, 38, died in Hillston Hospital, NSW after his jaw was broken and he suffered extensive head injuries.