The former Senate candidate for the Voluntary Euthanasia Party in South Australia, and bone cancer sufferer, was terminally ill when he took his own life on Monday.
According to ABC News, the 67-year-old used Nembutal, a lethal drug known as the "peaceful pill", in an Adelaide motel while surrounded by family.
Now Bromson's family and friends are under investigation into whether they assisted in his suicide.
"Max wanted to die with his family around him, and his family wanted to be there," Greens health spokesperson, Richard Di Natale, said.
"I am pleased that he was in a position to make that choice...but I am very saddened to learn that his family may be caught up in a criminal investigation."
Di Natalie, who is also a former GP, said the allegations indicate that law reform for euthanasia is "long overdue".
"The fact that being with him has put them at risk of jail shows precisely why the law needs to change."
Bromson reportedly filmed his own death as evidence his family did not assist him.
The decriminalisation of euthanasia has been heavily debated in the past. However, state governments have refrained from introducing new laws after failing to establish safe practices to protect abuse of the vulnerable.
Max Bromson (Voluntary Euthanasia Party via Facebook)