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 conclave is a time-honored process conducted in secrecy behind the locked doors of the Vatican’s Sistine Chapel.

Cardinals will begin the secret conclave, in The Vatican's Sistine Chapel, to elect the Catholic Church's 267th pope. DiNardo is one of 135 eligible cardinals who will make the selection behind closed doors.