I'm a bit surprised by the response to this post, though perhaps I'm misunderstanding it.
I took the OP as posing the question rhetorically, not asking seriously why we don't have a minute's silence for domestic violence victims (or shall we say intimate partner murder).
Violence against women is a part of our culture, it is so normal that it barely causes a ripple other than within the victim's immediate community.
Did anyone else read this report with two (adult) brothers talking about the loss of their mother and sister at their father's hands? Link: www.theguardian.com/society/2017/jun/17/we-didnt-recognise-that-he-was-dangerous-our-father-killed-our-mother-and-sister
The brothers talk a lot about how they felt the attack was minimised in the media and how they have noticed this in other reporting too.
"On the day of the attack, the police told the public that incidences such as these are “incredibly rare”. But just six weeks later, in County Cavan, Ireland, a woman called Clodagh Hawe and her three children, Liam, 13, Niall, 11, and six-year-old Ryan, were killed by Alan, her husband and the boys’ father. “And who knows,” Luke says, “that man in Ireland may have read one of the articles that described our dad as a nice guy.”
We excuse and accept violence against women. That's why it passes more or less unnoticed.