This undated photo provided by Tawny Williams shows Lisa Vilate Williams, killed while decorating a Christmas tree. Police say Lisa Williams, 26, was making homemade ornaments with her boyfriend's twin 3-year-olds when his ex-wife, 32-year-old Chelsea Watrous Cook, burst in and shot her to death in front of the children. Williams' family is sounding a warning about the devastating consequences of domestic violence that goes beyond two people. (Tawny Williams via AP)