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 to replace Pope Francis will begin Wednesday, May 7, the Vatican said on Monday. Cardinals will convene at the Vatican to begin a process of choosing a new pope, who will become the Catholic Church's 267th leader.

The Vatican released photos of the tomb of Pope Francis as it was opened for public viewing Sunday. He was buried in the Basilica of St. Mary Major in Rome on Saturday.