Tags: Criminal.
Caroline Grills born Caroline Mickelson (1890 – October 1960) was an Australian serial killer.Grills became a suspect in 1947 after the deaths of four family members: her 87-year-old stepmother Christine Mickelson; relatives by marriage Angelina Thomas and John Lundberg; and sister in law Mary Anne Mickelson. Authorities tested tea she had given to two additional family members (Christine Downey and John Downey) on 13 April 1953 and detected the poison thallium.