Stephen VI (896897): Strangled[11]
Stephen VIII/(IX) (939942): Mutilated[citation needed]
John XII (955964): Presumed murdered
Benedict VI (973974): Strangled[12]
John XIV (983984): Either by starvation, ill-treatment or direct murder[13]
Gregory V (996999): Poisoned[citation needed]
Chronological list of popes who are alleged to have been murdered
John VIII (872882): Allegedly poisoned and then clubbed to death[14]
Adrian III (884885): Allegedly poisoned[citation needed]
Leo V (903): Allegedly strangled[15]
John X (914928): Allegedly smothered with pillow[16]
Stephen VII/(VIII) (929931): Allegedly murdered[citation needed]
Sergius IV (10091012): Allegedly murdered[citation needed]
Clement II (10461047): Allegedly poisoned[17]
Damasus II (1048): Allegedly murdered[citation needed]
John XXI (1276-1277): While visiting the construction of a church, the roof collapsed on him, leading to conspiracy theories
Celestine V (1294, died 1296): Held captive and allegedly murdered after his abdication, by order of his successor, Pope Boniface VIII[18]
Boniface VIII (12941303): Death possibly (though unlikely) from the effects of ill-treatment one month before[19]
Benedict XI (13041305): Allegedly poisoned; no evidence provided[citation needed]
Pius XI (1922-1939): Allegedly (though unlikely), in connection with his doctor's having been the father of Benito Mussolini's mistress
John Paul I (1978): Death just 33 days after Papal election led to conspiracy theories[20]
Seems they don't get shot very often at all!
From good ol' Wikipedia;
https://en.wikipedia.org/wiki/List_of_murdered_popes