A jury has convicted an Iowa woman of first-degree murder in the death of her daughter-in-law. The Waterloo-Cedar Falls Courier reports jurors took only about two hours Tuesday to convict 57-year-old Ginger Jefferson in the stabbing death of Kerry O'Clair-Jefferson. Authorities say O'Clair-Jefferson was stabbed twice in the neck Sept. 25 and died in a house in Tama. Evidence found inside O'Clair-Jefferson's home led police to conclude that Jefferson was responsible. Authorities also on Tuesday charged Ginger Jefferson's son, Dustin Jefferson, with aiding and abetting first-degree murder in the death of his wife.