Hector Chavez, 38, has been charged with aggravated assault with a deadly weapon.
At around 10:45 p.m. on Christmas, police responded to a shooting call in the 300 block of East Rittenhouse.
When police arrived, they found 32-year-old Juana Saenz with a gunshot wound to the stomach. Saenz was then transported to the hospital in critical condition.
According to authorities, an investigation determined Chavez had shot his girlfriend in front of their 7-year-old son.
Authorities say the child was not injured during the incident.