I know many Catholics are suspecting foul play. I am a Trad and I rather liked Cardinal Pell. But I am also a registered nurse, and it is not unusual at all for a person to experience a blood clot after hip surgery (and also knee surgery). They are large joints. The blood vessels are small so it doesn't take a large clot to block an artery in the body. That is why even younger people receive blood-thinning medicine and compression stockings after joint surgery. Add the complications of high blood pressure and diabetes...had he been my relative I would have suggested that he try to get around without surgery, as I did with my father. (A friend had recently died of a blood clot after hip surgery.) Then there is the possibility of the vax, one or more. It's not a good combination. I am praying that he will rest in peace and speedily join the forces of us who are left here, fighting for the Church.