Paul McDonald, 47, had gone out to feed the animal on the property at Moyhu, south of Wangaratta, when the deer attacked him about 8:20am.
Paul and Mandi McDonald, 45, were at their Moyhu farm, about 260km from Melbourne, on Wednesday morning when the tragedy occurred. "There is a large family network and the [people] we've spoken to... it's beyond words how affected they are by this incident".
The woman, who sustained severe injuries to her legs and upper body, was airlifted to Melbourne's Alfred Hospital in a serious condition.
Local media said that the injured woman was helped from the deer's pen by her teenage son.
The man's wife was then attacked by the deer when she rushed to his aid. Voss said deer usually run away when humans approach, but this deer "had nowhere to run so he just attacked instead".
The couple had owned the Waipiti deer - a cross between a red deer and an elk - for about two years.
"The deer was shot a couple of times for the safety of the male and female", Acting Senior Sargent Purcell said. But there is a significant population of the Sambar deer species in north-east Victoria.
"It's tragic but not unheard of", Mr Howlett said.
There are as many as a million feral deer in Victoria, according to a 2017 state government report, with some species increasingly found in urban areas. Deer have been reported in backyards and schools, and rutting deer have been seen harassing cattle.
He added that Australia's deer farming industry, where valuable velvet is extracted from antlers, has "declined greatly over the last 20 to 30 years".
A deer being kept at the property.