Short answers, pulled from the story.
Maximilien Robespierre addressed the National Convention on the 26th of July 1794, was arrested the next day, and was executed by guillotine on the 28th of July 1794. His fall led to more moderate policies during the Thermidorian Reaction that followed.
Robespierre was arrested after his speech on the 26th of July 1794 alarmed deputies, who feared he was preparing another purge like those against the Hébertists and Dantonists. Jean-Lambert Tallien turned the Convention against him and demanded his arrest the following day.
Robespierre was executed by guillotine at the Place de la Révolution, the same site where Louis XVI, Georges Danton, and Camille Desmoulins had been executed. Executioner Charles-Henri Sanson carried out the execution.
In his speech to the National Convention on the 26th of July 1794, Robespierre spoke of internal enemies, conspirators, and calumniators within the Convention and the governing Committees. He refused to name most of them, which alarmed deputies who feared another purge.
Robespierre is one of the few revolutionaries without a street named for him in central Paris, though streets bear his name in the Red Belt, including Montreuil, and elsewhere in France. Plaques and monuments honoring him stand in Arras, Paris, Saint-Denis, Épinay-sur-Seine, and Vizille.
Robespierre pushed the National Convention to pass the Law of 22 Prairial, which he drafted with Georges Couthon. The law sped up trials and extended the death penalty to a new category of 'enemies of the people.'