for the border wall. and in the united arab emirates, four people are dead after a rescue helicopter crashed near the longest zipline. an investigation is under way. back to "dateline." welcome back to "dateline extra." i'm craig melvin. ethan mack awaited a jury verdict. would they find him guilty of murdering his best friend kate waring, or would they set him free? and what about his wife and accuser, heather kamp, the stranger kate met on a train? here again is keith morrison. >> you just never can tell how a jury will react to the fact of a complicated murder case or the accusations of a person like heather kamp. ethan mack cooled his heels while his jury tried to decide if he did or did not smother, beat, taser, and drown his best friend, the woman he claimed was like a little sister to him.