Queen Elizabeth II was laid to rest next to her late husband, Prince Philip, Monday, and now, with her funeral complete, many are weighing in on the probable cause of Her Majesty's death. ET's Kevin Frazier spoke to royal expert, Katie Nicholl at the Methodist Central Hall in Westminster, where she said the Queen «ultimately died of a broken heart,» just over a year after Prince Philip's passing in April 2021.«That moment where the Queen's coffin was lowered down into the royal vault was very, very powerful.