When Littlefinger finds out she is spying on him for Varys, he gives her to King Joffrey, who wanted to try something "new and daring". Joffrey used Ros as a live target, brutally killing her by shooting her and pinning her to his bed with multiple crossbow bolts.

Why does Joffrey kill Ros?

The only pleasure Joffrey derived was ordering Ros to beat her companion and make sure Tyrion saw the result. This was Joffrey's retaliation for his uncle coming to Sansa's defense and chastising him in front of the members of the court.

What episode does Roz die in Game of Thrones?

Bianco appeared as the character Ros, a prostitute in King's Landing, in the HBO series Game of Thrones. She first appeared in the series premiere "Winter Is Coming", returning for 13 more episodes, often in the show's noted "sexposition" scenes, before her character is murdered in the season 3 episode "The Climb".