We know in the show that
Jon Snow
has done this and is still alive at the end of the series. Who else is a King/Queenslayer and is still alive at the end of the series?
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Sign up to join this communitySee below for the complete list of royal deaths but to answer the question those who killed a King/Queen and are still alive are.
They planned out the kill on Margaery Tyrell and might not be dead.
Killed Stannis Baratheon.
Was involved in the killing of Renly Baratheon.
His actions killed Cersei Lannister.
She killed the Night King.
Killed Mance Rayder and Daenerys Targaryen, also his mother Lyanna Stark who was married to Rhaegar Targaryen died in childbirth giving birth to him.
Her fate is unknown but she could still be alive, she killed Myrcella Baratheon and Doran Martell.
To be complete let's go through the full list of monarchs in the series.
Aerys Targaryen: Killed by Jaime Lannister at the end of Robert's Rebellion.
Robert Baratheon: Killed by a boar whilst hunting, planned by Cersei Lannister and carried out by Lancel Lannister.
Joffrey Baratheon: Poisoned by Olenna Tyrell at the Purple Wedding.
Tommen Baratheon: Killed by himself, thought he could jump from too high of a height.
Margaery Tyrell: Killed by wildfire explosion, planned by Cersei Lannister, carried out by the Little Birds (Arthur in particular, he's the one who stabs Lancel Lannister) and Qyburn.
Stannis Baratheon: Injured fighting Bolton forces, killed by Brienne of Tarth afterwards.
Renly Baratheon: Killed by shadow baby, planned by Stannis Baratheon and carried out by Melisandre and to some extent Davos Seaworth.
Balon Greyjoy: Pushed off a bridge by Euron Greyjoy.
Euron Greyjoy: Killed in a duel by Jaime Lannister
Robb Stark: Killed by Roose Bolton at the Red Wedding.
Olenna Tyrell (Queen of Thorns): Killed by Jaime Lannister after he gave her poison.
Cersei Lannister: Killed by a ceiling collapse, planned by Daenerys Targaryen (somewhat) and carried out by Drogon.
Night King: Killed by Arya Stark.
Mance Rayder (King Beyond the Wall): Killed by Jon Snow after Stannis attempted to burn him alive.
Rhaella Targaryen: Died from complications in childbirth whilst giving birth to Daenerys Targaryen.
Daenerys Targaryen: Stabbed by the pointy end of Jon Snow's dagger.
Brandon Stark: Still alive at the end of the series.
Sansa Stark (Queen in the North): Still alive at the end of the series.
Yara Greyjoy (Queen of the Iron Islands): Still alive at the end of the series.
Bending the rules a bit the following are princes/princesses so let's add them in too.
Rhaegar Targaryen: Killed by Robert Baratheon at the Trident.
Elia Martell: Rhaegar's wife, killed by Gregor Clegane.
Viserys Targaryen: Killed by Khal Drogo when he couldn't wear the crown.
Myrcella Baratheon: Killed by Ellaria Sand as revenge for Oberyn's death.
Trystane Martell: Killed by the Sand Snakes for the same reason as Myrcella.
Oberyn Martell: Killed by Gregor Clegane.
Doran Martell: Killed by Ellaria Sand.
Ellaria Sand: Presumably killed by Cersei Lannister or by Drogon/Daenerys Targaryen during their attack on King's Landing but could still be alive.
Aegon Targaryen (Jon Snow): Killed by Allister Thorne and other members of the Night's Watch. (Later resurrected).
Lyanna Stark: Died from complications in childbirth whilst giving birth to Aegon Targaryen (Jon Snow).
Brienne of Tarth executed Stannis Baratheon after the Battle of Winterfell.
I believe we can consider Stannis as a king, there was a significant force that backed his claim (at least before the battle).
Well, in Targaryen history, there's also:
Maegor Targaryen: Was technically killed by the Iron Throne but probably assassinated.
Rhaenyra Targaryen: Killed by Sunfyre and Aegon II.
Aegon II Targaryen: Poisoned.
Daeron I Targaryen: Traitorously killed by Dornishmen under a peace banner.
Baelor Targaryen: Could've been poisoned by his uncle, Viserys II, either for the good of the realm or for the throne.
Viserys II Targaryen: Could've been poisoned by his son, Aegon IV, so he could ascend the throne sooner.
Maekar Targaryen: Killed while putting down the Peake uprising (possibly crushed by a rock during the storming of Starpike).
Aerys II Targaryen: Explained above.