Kenneth Barnes and New Witnesses

On August 28, 2003, pizza delivery man Brian Douglas Wells robbed a PNC Bank near his hometown of Erie, Pennsylvania, United States. Upon being apprehended by police, Wells died when an explosive collar locked to his neck detonated. The FBI investigation into his death uncovered a complex plot described as "one of the most complicated and bizarre crimes in the annals of the FBI".[1]

https://www.wired.com/story/collar-bomb/