Joseph Smith, founder of the Church of Jesus Christ of Latter-day Saints (LDS) and his brother Hyrum were killed in Carthage, Illinois by a mob of 150-200 men who stormed the Carthage Jail where the Smith brothers were awaiting trial on charges of treason.
The charges were related to the destruction of a newspaper that had criticized Smith. The event has become a defining moment in Mormon history, with Smith and Hyrum being regarded as martyrs by many Latter-day Saints. More