Terrance Matthews, 23, fatally stabbed his ex-girlfriend's grandmother and little brother Wednesday before holding leading them on a high-speed chaseA New Jersey man accused of murdering his ex-girlfriend's little brother and her grandmother before holding her hostage was arrested Thursday following a high-speed police chase, which he live-streamed on his Facebook page.Terrance Matthews, 23, of Willingboro, New Jersey, has been charged with two counts of murder, two counts of kidnapping and multiple weapon-related offenses in the Wednesday night stabbing deaths of Jennifer Vassell, 68, and Ishon 'IJ' Mathiln Jr., 9.