Helen McArthur Baker was born to William Alexander and Mary Hannah Lamson Baker on May 3, 1867, in Chicago, IL. Her father William was a bookkeeper in St. Louis, MO, where the family had settled by the 1880 census. Helen's younger siblings were all born in Missouri:
Morgan Lamson Baker (1869-1952)
Vernon Baker (1872-1925)
Margaretha Augusta Baker (1876-1895)
Helen apparently never married, but fell ill and died at age 23 on Aug 13, 1891, in a Battle Creek hospital of marasmus (severe wasting/malnutrition). Her body was shipped back to St Louis for burial at Bellefontaine Cemetery (according to the Transfer Permit and death record). She was buried to the right of her mother, Mary L (Lamson) Baker, August 15, 1891.