1929: Unidentified perp performed fatal abortion

On March 9, 1929, Alline L. Brown died in Chicago from a criminal abortion.
The culprit was never identified or brought to justice.

Keep in mind that things that things we take for granted, like antibiotics and blood banks, were still in the future. For more about abortion in this era, see Abortion in the 1920s.
For more on pre-legalization abortion, see The Bad Old Days of Abortion