Webthe slaying of deanna cook, captured on a 911 call, was one of several deaths that sparked dallas to reform how it handles domestic violence cases. But despite a swift arrest, the investigation into her homicide. Webit was deanna cook's death that changed how dallas police respond to domestic violence calls. Audio of her murder on august 17, 2012 was caught on a 911. But despite a swift arrest, the investigation into her homicide. Webdelvecchio patrick pleaded not guilty to the strangulation death of deanna cook two and a half years ago. She was allegedly on the phone with 911 when the. Webthe sequence of events detailed in the lawsuit filed last month by the family of deanna cook was damning:
