When officers arrived they found an apartment with a bloody footprint outside and a broken window, court paperwork said.
Inside the apartment, officers located 57-year-old Linda Harris. She suffered a gunshot wound to the head and was pronounced dead at the scene, officials said.
While at the apartment complex, a witness told officers he was present during the shooting and was able to help police find the suspect.
The man says he and the victim were playing cards when she was shot, court documents said. He was also covered in blood and "human tissue."
After combing through surveillance footage from the apartment complex, a woman was seen on video walking away from the scene, court documents said. The suspect was wearing a white T-shirt, white pants and Nike sandals.
The suspect was later identified as 53-year-old Dorothy Lee.
On Sept. 6 authorities served a search warrant at Lee's home and discovered clothes stained with what is believed to be blood, authorities said.
The suspect was taken to the Glendale Police station for questioning and initially said she wasn't at the apartment when the shooting occurred but later changed her story and admitted to being in the unit playing cards, court paperwork said. She continues to deny shooting the Harris because she "does not know her well."
Lee has been booked on one count of first-degree murder and one count of aggravated assault with a deadly weapon.