It happened last Wednesday in the 4600-block of Main Street.
Investigators say Miguel Renteria called 911 to report that he had stabbed Cynthia Renteria and her infant daughter. When officers got to the home they discovered their bodies on the living room floor.
CALLER: "My granddaughter and my daughter are dead."
911: "They're dead?"
911: "What do you mean they're dead? How are they dead?"
CALLER: "I killed them."
911: "You killed them?"
911: "Why did this happen? Was there a fight? What was going on?"
CALLER: "I'll explain it to you when you get here."
Miguel Renteria is charged with the murders.
Police have not released a motive in the crime.