Asotin County Sheriff's deputies responded to 2720 Scenic Hills Drive just before 10 p.m. Once inside they found the couple dead.
"When the deputies arrived they found Shannon McCullough and her husband Craig McCullough were both dead," said Captain Dan Hally of the Asotin County Sheriff's Office. "Shannon died as a result of a gunshot wound and Craig died as a result of a self-inflicted gunshot wound and at this time we have ruled it as a murder-suicide."
Shannon McCullough was 38. Craig McCullough was 45.
Hally said two rifles were involved in the shooting. He also said children were in the home at the time of the shooting.
"There were three family members that were home," said Hally. "One being 21, one being 13 and then a one-year-old child and none of those were harmed during the incident."
Hally said someone inside the residence contacted a grandmother who then called 911. He said at this time they are not releasing who that was or if it was before or after the shots were fired.
Asotin County Coroner Ben Nichols said at this point they have not requested an autopsy.
Hally said there is no history of domestic violence calls to the address.
Hally said Clarkston Police and the Washington State Patrol assisted at the scene.
This is the second deadly domestic violence shooting in less than a week. Early Monday morning 22-year-old Ryan T. Crabson shot and killed himself after firing at his girlfriend's vehicle in Asotin. She and a passenger were not injured.