Marcel Petiot (17 January 1897 – 25 May 1946) was a French medical doctor and serial killer. He was convicted of multiple murders of Jews after the discovery of the remains of 23 people in the basement of his home in Paris during World War II. He is suspected of the murder of about 60 to 200 mostly Jewish victims during his lifetime, although the true number remains unknown. During the Nazi occupation of France in World War II, Petiot set up a fake escape network under the name “Dr. Eugène.” He claimed he could help Jews and others wanted by the Gestapo flee to South America via Portugal, FOR A LARGE FEE. He lured his victims to his home at 21 Rue Le Sueur in Paris, promising them safety. INSTEAD, he MURDERED them—often by injecting them with poison under the pretense of giving them vaccinations—and then stole their valuables and disposed of their bodies, frequently by burning them.

Despite showing early signs of mental illness and criminal behaviour, Petiot served in the First World War, graduated from an accelerated medical program, and began a dubious medical career that included performing abortions and supplying narcotics. His political career was marked by scandal, theft, and corruption. Captured in 1944, Petiot claimed to be a Resistance hero who killed only the enemies of France. He was convicted of 26 counts of murder and was executed by guillotine in 1946. His life and crimes have been depicted in film and comic books.
(From Wiki)