An off-duty Brooklyn cop has confessed to shooting her ex-girlfriend and killing another woman.Yvonne Wu of Brooklyn’s 72nd Precinct was charged with the attempted murder of her ex-girlfriend Jenny Li (23) and the murder of Li’s new girl friend 24-year-old Jamie Liang.Warning: This story has details of a murder and might be distressing to some readers. For 24 hour crisis support and suicide prevention call Lifeline on 13 11 14. For Australia-wide LGBTQI peer support call QLife on 1800 184 527 or