It's the incriminating evidence that prosecutors say shows a husband making what they believe is a poisoned protein shake for his wife. And perhaps most shocking of all, another video they played in court shows him holding a syringe moments before they say he gave her a fatal injection while she was in the hospital. Watch 20/20's "21 Days to Murder" full episode premiere tonight (Sept. 19th) at 9/8c on ABC. Stream on Hulu and Disney+. #TrueCrime #Investigation #JamesCraig #MurderMystery #Evidence