Question: April O'Neil is a fictional character from the Teenage Mutant Ninja Turtles comics. She is the first human ally of the Turtles: Leonardo, Donatello, Raphael, and Michelangelo. April made her first appearance in the Mirage comic series in 1984 as a computer programmer. She was later portrayed as a strong-willed news reporter in the Turtles' first animated series, as a warrior in the Teenage Mutant Ninja Turtles Adventures comic produced by Archie Comics, and various other personas in different TMNT media.

In the 2003 cartoon series, April, voiced by Veronica Taylor in English and Yuko Kato in Japanese, got a costume change and her hair color was altered to a dark magenta tone for the new incarnation of the animated series produced by 4Kids Entertainment. However, her role was similar to that of the Mirage Studios character: again, she served as an assistant to Baxter Stockman until his Mouser experiments got out of control, and after the Turtles saved her she became a faithful friend, ally, and "big sister" to them. April made much more use of her scientific expertise and she often used her computer skills to aid the Turtles. She developed a closer relationship to Donatello, who shared many of her interests. In Season 7 she sometimes helped Donatello to collect Splinter's data bits. April developed a modest knowledge of combat skills after training with Splinter. Her quick thinking was often instrumental to the Turtles' survival. April is romantically attracted to Casey Jones, though their contrasting personalities often make them bicker. By the third season, the two seemed to have quite a serious romantic relationship. In the series finale, "Wedding Bells and Bytes", she and Casey finally got married. The young adult April continues to learn how to defend herself against Foot ninjas and other monstrosities by undergoing basic ninja training from the Turtles. She is quite skilled in some useful firearms, and can easily go through a laser grid with no problem at all. In the seventh and final season, she dons a yellow-and-black jumpsuit and carries a tanto sword to further perfect her fighting skills. At one point, she became psionically linked with a female mermaid-like mutant who had telepathically shown her the hardships of her childhood and that the few of her kind were on the verge of extinction. In addition to her recently developed ninjutsu skills, April is incredibly intelligent, smart and resourceful in complex scientific fields; similar to her good friend Donatello. So much that she even had worked for the eccentric Baxter Stockman as his assistant. She was able to hack into the computers of Shredder's stronghold and even breach several codes. She was seen wielding a katana in the special episode "Turtles Forever".

Using a quote from the above article, answer the following question: What is O'Neil's role in Teenage Mutant Ninja Turtles?
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Question: Milos Obilic (Serbian Cyrillic: Milosh Obilitsh, pronounced [miloS obilitc]; died June 15, 1389) was a Serbian knight in the service of Prince Lazar, during the invasion of the Ottoman Empire. He is not mentioned in contemporary sources, but he features prominently in later accounts of the Battle of Kosovo as the assassin of the Ottoman sultan Murad I. Although the assassin remains anonymous in sources until the late 15th century, the dissemination of the story of Murad's assassination in Florentine, Serbian, Ottoman and Greek sources suggests that versions of it circulated widely across the Balkans within half a century after the event. It is not certain whether Obilic actually existed, but Lazar's family - strengthening their political control - "gave birth to the myth of Kosovo", including the story of Obilic.

The earliest sources on the Battle of Kosovo, which generally favour the cult of Prince Lazar, do not mention Milos or his assassination of the sultan. The assassination itself is first recorded by Deacon Ignjatije on 9 July 1389, only 12 days after the battle. The assassination of sultan Murad and one of his sons was also mentioned in the instructions of the Venetian Senate issued to Andrea Bembo on 23 July 1389, although Venetians were uncertain if news about the assassination were true. On 1 August 1389 King Tvrtko I of Bosnia (r. 1353-1391) wrote a letter to Trogir to inform its citizens about Ottoman defeat. Victory over the Turks (Latin: ob victoriam de Turcis) was also reported by Coluccio Salutati (died 1406), Chancellor of Florence, in his letter to King Tvrtko, dated 20 October 1389, on behalf of the Florentine Senate. The killer is not named but he is described as one of twelve Christian noblemen who managed to break through the Ottoman ranks: "Fortunate, most fortunate are those hands of the twelve loyal lords who, having opened their way with the sword and having penetrated the enemy lines and the circle of chained camels, heroically reached the tent of Amurat [Murad] himself. Fortunate above all is that one who so forcefully killed such a strong vojvoda by stabbing him with a sword in the throat and belly. And blessed are all those who gave their lives and blood through the glorious manner of martyrdom as victims of the dead leader over his ugly corpse." Another Italian account, Mignanelli's 1416 work, asserted that it was Lazar who killed the Ottoman sultan. The assassin's first appearance in Serbian sources is in the biography of Stefan Lazarevic, Lazar's son, by Constantine the Philosopher, written in the 1440s. The hero, still anonymous, is described as a man of noble birth whom envious tongues had sought to defame before the prince. To prove his loyalty and courage, he left the front line on the pretext of being a deserter, seized the opportunity to stab the sultan to death and was killed himself shortly afterwards. The initial phase of ignominy and its redemption by a courageous plot of slaying the sultan are narrative ingredients which would become essential to the Serbian legend as it evolved in later times.

Using a quote from the above article, answer the following question: What was the assassination of the sultan?
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The assassination itself is first recorded by Deacon Ignjatije on 9 July 1389, only 12 days after the battle.