LONGVIEW, Wash. (KATU) — A married couple got into a fight and killed each other on Halloween night at a Longview home, the Cowlitz County Sheriff’s Office said Thursday.

Investigators said the couple’s 11-year-old child was in another room playing video games wearing headphones and did not see what happened, but the child called 911 when he discovered their parents were injured.

Deputies went to the home on Olympia Way and found the couple in the kitchen. They died on the spot.

The sheriff’s office said Juan Antonio Alvarado Saenz, 38, died of multiple stab wounds to the chest. Cecilia Robles Ochoa, 39, died from gunshot and stab wounds.

Investigators found a gun and a knife at the scene. They said the gun was stolen from Alvarado Saenz’s employer.

Investigators said they could not determine who started the fight.

After conducting interviews, investigators said they learned the couple’s relationship was strained and they were planning to separate.