CHICAGO (CBS) -- A domestic violence call led to the discovery of a grisly scene in the South Chicago neighborhood this weekend. 

It started Friday night when a woman reached out for help after a terrifying text from her sister. 

Police arrived at a home near 89th Street and Mackinaw Avenue just before 10 p.m. Friday.

Officers said when they knocked on the door, a man came to a window and closed the curtains, and then they heard heard at least five shots. 

SWAT teams were called as a precaution. 

Police later found a 20-year-old woman and a 30-year-old man dead inside an apartment. 

Both suffered gunshot wounds to the head. 

The Cook County Medical Examiner's office ruled the woman died in a homicide and the man in a suicide. Their identities were not available Sunday afternoon.