A Westminster woman arrested Sunday on suspicion of murder is accused of fatally stabbing her mother during an argument, according to court documents.

Sarah Riste and a small child were sitting on the steps outside the home in the 3300 block of 92nd Place when Westminster officers arrived just before 2 p.m. Sunday, according to the arrest affidavit.

Riste didn’t reveal much to officers, only telling them that there had been an accident inside the house and permitting them to enter, police said in the affidavit. She had been the one to call 911, police said.

As officers entered the house, they noticed a large amount of blood on the walls and a body under several blankets on the floor at the end of the hall.

The woman under the blankets, identified by police as 64-year-old Kathy Johnso

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