Known suicides in "A Song of Ice And Fire"

Question

Besides the lately known suicide of

King Tommen Baratheon/Lannister.

Is there any other suicide either in TV show or books? Please disregard the suicides of peasants and soldiers, just the "important" people.

Also, if it's known, how did that person kill him/herself?

Answer 1

[Note: This answer will be heavily based the materials presented in the main ASOIAF books and the other companion works.]

Probably the only other "relevant" character to commit suicide was

Ashara Dayne

jumped from the top of one of the towers of Starfall, called the Palestone Sword, on the cliff atop the sea. The body was never recovered.

Who was rumored to be

loved by Ned Stark. It is rumored that she committed suicide after after giving birth to a still-born child. The fan theory is that it was Ned's.

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Other "important" (not common-folk or soldiers) I can find are:

• Maester Cressen in his service to Stannis attempted to kill Melisandre by poisoning a cup of wine. Once the cup was poisoned, he offered​ to share it with her, knowing that once they both drink they would both be dead. However, with the help of her magic necklace, Melisandre was able to survive.
• Gael Targaryen committed suicide by drowning herself in the Blackwater Rush. The reason for her suicide was that she had been seduced and abandoned by a traveling singer, who had left her pregnant.
• Aelora Targaryen was married to her twin brother, Prince Aelor. Aelora caused Aelor's death in a mishap, which left her mad with grief. Aelora took her own life after being attacked at a ball by three men.
• Helaena Targaryen, at the age of twenty-one, jumped from her window in Maegor's Holdfast at sunset. She died on the spikes below, with her throat impaled.
• Jaehaera Targaryen reportedly threw herself from Maegor's Holdfast (akin to that of her mother, Queen Helaena Targaryen) and was impaled on the spikes of the dry moat below. She lived for a half hour in agony before her death
• The wife of Eustace Osgrey committed suicide. This made Ser Eustace the last of his line.

and then probably the most famous/infamous was

• Aerion Targaryen aka Aerion Brightflame died screaming after drinking a cup of wildfire, believing it would transform him into a dragon.

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The last one I can think of is debatable depending on what actually happened but,

Jaqen H'ghar, or at least one of the Faceless Men

drinks a poison when a debt is owed to the gods when

Arya kills Meryn Trant

This is debatable because the said character is still shown to be alive, but there is no doubt a dead body to be accounted for...

Answer 2

The answer by @Skooba covers the majority of these cases but I can think of a few more.

Maegor "The Cruel" Targaryen

Although it is unknown how exactly he died common belief is that he commited suicide.

Maegor's response to this was slow and confused, and it seems that this series of betrayals—and perhaps even the loss of his mother's guidance—had left him, in his own way, as broken as Aenys. He called his loyal lords to King's Landing, but all that came were minor lords of the crownlands, who had little to marshal against the king's many enemies. It was late at night, during the hour of the wolf, when the remaining lords departed the council chamber, leaving Maegor to brood alone. Early the next morning, he was found dead on the throne, his robes sodden with blood, his arms slashed open by the barbs of the Iron Throne.
Thus ended Maegor the Cruel. How he came to die is a matter of much speculation. Though the singers would have us believe that the Iron Throne itself killed him, some suspect his Kingsguard, and others some mason whom the king had failed to kill and who knew the secrets of the Red Keep. But perhaps even likelier is the suggestion that the king killed himself rather than suffer defeat. Whatever the truth, it was a reign that ended in the only way it could after the six years of terror that Maegor had visited upon the realm. But his nephew's reign would do much to mend the deep wounds he had made in the Seven Kingdoms.
_{The World of Ice and Fire, The Targaryen Kings: Maegor I}

Qhorin Halfhand

Although not technically suicide he persuades Jon to kill him to win favour from the wildlings.

"I've told you the truth. Our garrons were failing, and Rattleshirt was close behind us. Qhorin told me to pretend to join the wildlings. 'You must not balk, whatever is asked of you,' he said. He knew they would make me kill him. Rattleshirt was going to kill him anyway, he knew that too."
_{A Storm of Swords, Jon IX}

House of Black and White Visitors

Many people come to the House of Black and White to be given the gift and drink poison from the fountain.

Sky cell prisoners

Tyrion's arms were too short to reach the plate, and he was not about to step that close to the edge. All it would take would be a quick shove of Mord's heavy white belly, and he would end up a sickening red splotch on the stones of Sky, like so many other prisoners of the Eyrie over the centuries. "Come to think on it, I'm not hungry after all," he declared, retreating to the corner of his cell.
_{A Game of Thrones, Tyrion V}

Answer 3

Selyse Baratheon hung herself.