A woman was killed and an infant was critically injured in a shooting Saturday night at an apartment in the 7700 block of Willow Chase Boulevard, according to Houston police.

The infant's father went to the apartment to deliver diapers and got into an argument with the 19-year-old mother, police said.

He then pulled out a gun and shot the woman's mother, about 40, in the back before shooting the baby in the abdomen.