Residents told police Cancienne had come home drunk around 3 a.
The two appear to have begun dating sometime around his release from prison in November 2011.
Asked repeatedly for information, a department spokesman refused to answer and said the footage was still under investigation.
She was pronounced dead at the scene.
But the beatings intensified over the past few weeks after Sanders accused her of sleeping with someone else, McGregor said.
Whatever she did, she didn't deserve that.