Albert Parker, 72, was one of several older men in Cincinnati who died after receiving care from Anna Marie Hahn, a German-born woman later nicknamed Arsenic Anna and The Blonde Borgia. Parker had lent Hahn $1,000 and the loan was recorded on an I.O.U. that vanished after his death, removing clear documentary evidence of the debt.

Hahn’s crimes took place during 1933–1937 and investigators later determined she used arsenic to poison victims, aiming to hasten their deaths and gain financially. Her scheme came to light after George Obendoerfer’s death in Colorado Springs, when an autopsy showed high arsenic levels; exhumations of prior clients then revealed poisoning and led to Hahn’s 1937 arrest. Hahn was convicted of first-degree murder and executed in 1938.

Are there descendants or relatives of Albert Parker who can add detail about his life or the missing I.O.U.?