Was KR aware of JOK wanting to break up with her or is it something he was telling others? Also does KR have history of domestic violence or rages? That would be very important to know IMO.
If JOk was just telling others he wanted a break up, then I'd want to see something written or recorded so we'd know it was fact and not something made up. I read that the relationship may have been tumultuous but there are many relationships like that that doesn't come to murder. That's why a history of stalking or DV or rages would be important.
This is the Commonwealth's Statement of Case.
According to JOK's niece, about a week before his death, JOK had told KR that their relationship had "run its course," and had asked her to leave the house...but she said she did not want the relationship to end and refused to leave the house. His nephew recalled something similar.
Obviously, read thru the PDF for more detail.