Tualatin Police were called to a house on Shawnee Trail Street in Tualatin late Thursday night on an assault.
The house is located west of the Tualatin Country Club.
Police found a 73-year-old woman dead and a 47-year-old man with serious injuries.
The woman died from homicidal violence. Police aren't saying how she was killed.
Inside of the house police arrested 40-year-old Michael Ross, of Tualatin. He's charged with Murder and Attempted Murder.