Robespierre's followers came to him after they had heard gossip from other committee members questioning his leadership. Robespierre took this as a threat instead of a difference in opinion. Soon after he delivered a hateful speech, turning the accusations onto his accusers, calling them traitors and inspiring fear of death in them.
Robespierre and his friends were arrested on July 27, 1794 by the National Assembly. While being held the two others he was with killed themselves, one jumped out the window and the other shot himself. Robespierre tried to kill himself with a gun as well, but was unsuccessful and only severely wounded his jaw.
On the evening of July 28th he was guillotined without a trial. More of his followers were killed in the following 82 days after his death. The execution of Robespierre brought the end of the reign of terror.