The ex-boyfriend of a New York City woman who was shot dead as she pushed their infant daughter in a stroller has been ordered jailed without bail, with prosecutors describing the killing as a “premeditated execution.” Isaac Argro, 22, appeared Saturday evening in Manhattan Criminal Court on charges of second-degree murder and second-degree weapons possession. Prosecutor Brittany DeCesare told Judge Eric Schumacher that on the night of the killing, Argro dressed in all black and wore a ski mask as he paced back and forth waiting to shoot Azsia Johnson, his estranged girlfriend.