Responding to Thursday's mass shooting at a cinema in the US city of Lafayette, Louisiana, the 35-year-old posted a message saying that cinema goers should not have to face the prospect of being a shooting victim.
In 1996, 28-year-old Martin Bryant opened fire with a semi-automatic rifle at a cafe in Port Arthur, Tasmania.
Thirty-five people were killed in the mass shooting, considered the deadliest in Australia's history.
In response, the Australian government - under then Prime Minister John Howard - introduced the the National Firearms Agreement, which outlawed pump-action shotguns, automatic and semi-automatic rifles.
A national gun buyback scheme resulted in more than 640,000 weapons handed in to authorities.
Tributes flow for shooting victims
Twenty minutes into the showing of 'Trainwreck' at the Lafayette, Louisiana theater, two women were gunned down by a stranger.
After killing the pair and wounding nine others, the suspected gunman, John R. Houser, turned his .40 caliber handgun on himself, bringing the latest episode of apparently random gun violence in the United States to a swift, shocking end.
Police are still trying to determine the motive behind the shooting.
The director and actors from the film 'Trainwreck' also expressed their sadness and offered their condolences.
“My heart is broken and all my thoughts and prayers are with everyone in Louisiana,” actress Amy Schumer tweeted.
Director Judd Apatow said the circumstances of the shooting were tragic.
"One of the reasons we make these movies is because the world can be so horrifying and we all need to laugh just to deal with it," he said in a statement.
"So to have this happen in a room where people were smiling and laughing devastates me. My thoughts and love go out to the victims and anyone touched by this madness or any madness. We, as a country, need to find a way to do better."
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Jillian Johnson, 33, and Mayci Breaux, 21, were both creative, ambitious young women who had big plans, their friends and families said on Friday.
"She was a once-in-a-lifetime gal," her husband Jason said in a statement. "She was the love of my life and I will miss her always."
Two dozen floral bouquets lined the sidewalk in front of the now-closed shop in an upscale shopping center in Lafayette.
“We brought fresh flowers from our garden because that’s what Jillian would have preferred,” said Jan Risher, a friend of the couple, as she laid a bouquet in front of the shop in Johnson's honor.
Funeral service planned
A funeral service for one of the two women killed in a Lafayette, Louisiana theater shooting will be held on Monday, the mortuary handling the arrangements said.
Mayci Breaux, 21, will be remembered in an 11 a.m. Mass of Christian burial at the Church of the Assumption in Franklin, Louisiana, Ibert's Mortuary said in an online obituary. Franklin is about 50 miles southeast of Lafayette.
Questions continue to surround Houser's motive for the shooting, his background and his mental state. Houser was once hospitalized for psychiatric care, had a volatile relationship with his family, and espoused hatred for the government.
Houser's brother Rem Houser told CNN he had always thought his brother was more passionate about issues than dangerous.
"Nothing that made me alarmed or that would signal that something like this would happen, I never saw that," he said.
But Rem Houser, who lives in Atlanta, also noted they had not been in contact for 10 years, and last heard from his brother a month ago when he needed money.
- with Reuters
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