Yes many catholic popes were murdered. Here is the list:
- Stephen VI (896-897) - Strangled
- Stephen VII/(IX) (939-942) - Mutilated
- John XII (955-964) - Murdered by cuckolded husband
- Benedict VI (973-974) - Strangled
- John XIV (983-984) - Either by starvation, ill-treatment or direct murder
- Gregory V (996-999) - Poisoned
- Boniface VIII (1294-1303) - Death possibly (though unlikely) from the effects of ill-treatment one month before
- John VIII b - Allegedly poisoned and then clubbed to death
- Adrian III (884-885)- Allegedly poisoned
- Leo V (903) - Allegedly strangled
- John X (914-928) - Allegedly smothered with pillow
- Stephen VII/(VIII) (928-931) - Allegedly murdered
- Sergius IV (1009-1012) - Allegedly murdered
- Clement II (1046-1047) - Allegedly poisoned
- Damasus II (1048) - Allegedly murdered
- Benedict XI (1304-1305) - Allegedly poisoned; no evidence provided
- John Paul I (1978) - Surprising death just 33 days after Papal election prompted scrutiny and birthed a myriad of conspiracies theories; no evidence provided