Pei Xia Chen welcomed Angelina on Tuesday. The baby’s father, Officer Wenjian Liu, 32, was shot and killed on Dec. 20, 2014 along with Officer Rafael Ramos, 40, as they sat in a patrol car.

On the night of the shooting, Chen asked for her husband’s semen to be frozen, according to the New York Daily News. The couple was married for three months before his death.

Liu’s mother told the Daily News that Angelina was “like an angel, like my son is an angel. I’m just so happy.”