Pope Francis's death at the age of 88 means the Catholic Church must choose a new leader. Here's how cardinals elect the next pontiff at the conclave.

The papal conclave will commence in May, when the cardinals will meet at St. Peter's Basilica and pray for the wisdom to select the next pope.

Final preparations are underway to start the conclave, which will elect Pope Francis' successor. The Vatican released video of workers installing a stove where ballots will be burned during the process.