Marjorie Diehl-Armstrong

Marjorie Diehl-Armstrong (February 26, 1949 — April 4, 2017) was an American serial murderer recognized for her role in the infamous PNC Bank robbery involving Brian Douglas Wells on August 28, 2003, in Erie, Pennsylvania. The case became known as the pizza bomber or "collar bomb" case.

Diehl-Armstrong was born on February 26, 1949, in Erie, Pennsylvania. She came under the spotlight in 2003 when she was found responsible for organizing a complex conspiracy that involved the kidnapping of a pizza delivery man (Brian Douglas Wells) and placing of a bomb device on his neck in order to rob a subsidiary of the PNC bank. The plot ended in the death of 46-year-old Wells when the bomb locked to his neck exploded following the robbery. Dressed as a pizza delivery man, Wells walked into the bank with the collar bomb around his neck. He escaped with $8,702 but was stopped by police shortly after. They handcuffed him while they waited for a bomb squad to arrive, but before they got there, the bomb exploded, killing Wells.

Due to its characteristics, the episode was designated as Major Case number 203 by the FBI, and Marjorie was sentenced to life imprisonment in 2011, receiving the same sentence as one of her accomplices, Kenneth Barnes.

While serving her sentence, Diehl-Armstrong died of cancer on April 4, 2017, at Federal Medical Center in Carswell, Texas, at the age of 68.

In May 2018, Netflix released a documentary titled "Genius of Evil," in which Trey Borzillieri, its narrator, recounts the details of this story and the more than 10 years of contact he had with the woman during the judicial process. Diehl-Armstrong was also found guilty of murdering two of her ex-partners, William Roden and Robert Thomas, as well as being diagnosed with Bipolar Disorder.