In recent years, knowledge about intrafamilial homicides has evolved, making it possible to more effectively target at-risk situations and thus optimize their prevention. For the various organizations working with people living in a situation where a risk of death is present, it appears that collaboration between the various community partners involved is an important condition for improving the prevention of intrafamilial homicides. It is in this perspective that the partners in Montérégie-Ouest, a region of Quebec, have adopted a new collaborative mechanism: the P.H.A.R.E. Agreement (Prevention of intrafamilial homicides through quick and committed actions). This article describes how this collaborative arrangement works and provides an overview of this collaboration based on the discourse of key stakeholders at the heart of this initiative. The results show a positive assessment of the operation, the use and the impact on the practices of the P.H.A.R.E. Agreement, as well as on the collaboration in this region of Quebec. Involving Agreement partners proves to be a valuable tool in managing high-risk homicide situations and imminent danger situations.