Woman fatally shoots three male relatives before killing herself

Facebook post accused father, brother-in-law and his father, of either physically abusing woman's sister or ignoring it

A Massachusetts woman shot her brother-in-law, his father, her own dad and herself to death after she publicly accused the first man of physically abusing her sister for years while the other two - along with additional relatives - stood idly by, according to authorities and a chilling social media post that offers an apparent motive for the violence.

The gruesome saga began with a Facebook post published on the afternoon of 23 August in which Khosay Sharifi recounted how her sister has been choked, slapped, kicked, punched in the face and cursed out by her husband of 14 years.

In the US, the National Suicide Prevention Lifeline is at 800-273-8255 and online chat is also available. You can also text HOME to 741741 to connect with a crisis text line counselor. In the UK and Ireland, Samaritans can be contacted on 116 123 or email jo@samaritans.org or jo@samaritans.ie. In Australia, the crisis support service Lifeline is 13 11 14. Other international helplines can be found at www.befrienders.org