"This breaks my heart man ... I can't stand this crap. We cannot let this happen ever again. Stand up against domestic violence. Lord, I just pray for absolute peace for her whanau right now."
Since Walker's tweet, other prominent New Zealanders have voiced their support.
Sports personality Phil Kingsley-Jones said the murder was "absolutely horrific".
"To think it's our own people across the world doing this, it's totally unacceptable ... You want to reach out to people and tell them it's not acceptable to beat your partner."
Former All White Harry Ngata said: "Absolutely tragic, and yet another horrific example of why as men we need to get our act together and stop this abuse."
Labour police spokesman Kelvin Davis said Brown's death was totally avoidable.
"It occurred simply because a man chose to be violent," he said. "We need to teach our sons, our brothers, our nephews, our mates, our fathers, our uncles and total strangers to love and respect the women in our lives."
Said Auckland Mayor Len Brown: "Violence against women is unacceptable, and as a man I want to play my part in ending this violence."
White Ribbon campaign manager Rob McCann said it meant a lot for well-known personalities to speak up.
"The reality is that we all look up to some people as heroes and they influence our behaviour," he said. "So having people we know demonstrate the values that we should be living is really, really helpful."
The White Ribbon Campaign is a global movement to end male violence against women and girls.
A fundraising page set up to help Ms Brown's daughter had more than $15,000 yesterday.
"We all have seen or heard in some way about the tragic event that has taken place with our beautiful Tara and the effects this has had on her baby girl and extended family is heartbreaking," organiser Shelly Martin wrote. "It would be greatly appreciated if we could all pull together and help raise as much as we can ... Continue praying for Tara, her daughter needs her mummy and her family need her."
Ms Brown was described as "a beautiful girl with a beautiful heart" and a "free spirit with a smile that lights up the room".
Last year, Edward Livingstone killed his children Bradley, 9, and Ellen, 6, at their Dunedin home.
Dunedin police said the children's mother, Katherine Webb, had previously disclosed that Livingstone had raped her for five hours while her daughter banged on the door.
In 2009, David White's daughter Helen Meads was murdered by her husband Greg at their Matamata farm.
Yesterday, Mr White told the Herald: "Men in her circle of acquaintances knew what was going on and have done nothing.
"The greatest sin we all have is that we are not quick enough to step up, make a comment or offer support."
