Short answers, pulled from the story.
Pierre Roger Ducos cast his ballot for the execution of King Louis XVI on the 21st of January 1793. This decision occurred during a session in the National Convention where he sat among deputies known as The Plain.
Paul Barras named Pierre Roger Ducos a member of the executive Directory following the coup d'état orchestrated by Barthélemy Catherine Joubert on the 18th of June 1799. Barras relied on Ducos as his partisan during these turbulent political times.
Napoleon Bonaparte formed the Provisional Consuls with Emmanuel-Joseph Sieyès and Pierre Roger Ducos on the 9th of November 1799. Ducos subsequently became vice-president of the Senate within this new government structure.
The Restoration government enacted laws targeting regicides who had executed the king, leading to the exile of Pierre Roger Ducos in 1816. He failed to gain favor with the new regime despite attempting to avoid punishment for his past actions.
Pierre Roger Ducos died near Ulm on the 16th of March 1816 after being involved in a carriage accident. His death occurred far from Paris where he once held significant political power.