The source seems to be Israeli claims that “the signs are that he has been killed…”
Volume and certainty added by Donald Trump
Meanwhile Iran’s finance minister "confirms"the Leader is alive.
Iran’s Supreme Leader Ayatollah Ali Khamenei is alive, the country’s finance minister confirmed after a report stating his death surfaced on Saturday. As the US and Israel struck Khamenei’s compound in Tehran, Israel’s Channel 12 television reported, citing sources, that there are ‘growing signs’ that the supremo may have been killed, The Times of Israel reported. However, the report was dismissed.
There was also a rumour about the Iranian president being killed, but I’ve just seen him talking on a live link to US TV.