May 11, 1961 - Donald Piper
The confirmed cases span four years and two crime scenes, but investigators have long believed the full scope of Piper's violence extended further — four additional killings remain unresolved, with him as a suspect. His crimes targeted women in hotel settings across the Des Moines area, a pattern that points to deliberate method rather than circumstance.
From Wikipedia
Donald Arthur Piper (born May 11, 1961) is an American murderer and suspected serial killer convicted of killing two women in hotels around West Des Moines and Clive, Iowa in 1993 and 1997, but is considered a suspect in four other killings. For his confirmed crimes, Piper was convicted and sentenced to two life terms.
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