Aaron Fitzpatrick, 19 of South Philadelphia, was arrested for allegedly shooting his girlfriend to death early Thursday morning because he was angry that she was pregnant with his child.

Around 2:20 a.m., police responded to a home on Mildred Street near Wolf and found Tiffany Gillespie, 24, lying on the floor in the basement, police said.

Gillespie was shot once in her head, and was pronounced dead on the scene by medics, police said.

Fitzpatrick, of 8th Street near McKean, faces charges of murder, murdering an unborn child, and weapons violations, police said.