( KTRS ) St. Louis police now say that a double shooting on the city’s north side was a murder-suicide.

The shooting happened Sunday night. Police say 24-year-old Chimera Mayo was found dead inside her home. She had been shot in the head.

Police say a 24-year-old man shot Mayo before turning the gun on himself. He was taken to a hospital where he later died. His name has not been released.

Authorities believe the two were in a relationship and argued, leading to the fatal shootings.

The woman’s death marked the 169th homicide in St. Louis this year. There were 159 killings in all of 2014.