Short answers, pulled from the story.
Peter II of Russia was fourteen years old when he died on the 30th of January 1730. He had reigned as emperor since 1727, when he was eleven years old, and died of smallpox before completing three years on the throne.
Peter II was first controlled by the minister Aleksandr Danilovich Menshikov, who moved the young emperor into his own house and dominated all his actions. After Peter exiled Menshikov to Siberia in September 1727, the Dolgorukov family, particularly Prince Aleksey Dolgorukov and his son Ivan, became the dominant influence over the emperor.
Peter II was the only son of Tsarevich Alexei Petrovich, who was himself the only living son of Peter the Great. When Peter II died of smallpox in 1730 without producing an heir, the direct male agnatic line of the House of Romanov ended. The throne passed to his cousin Anna Ivanovna.
Aleksandr Menshikov was stripped of his rank and exiled to Siberia by Peter II in September 1727. Peter had grown resentful of Menshikov's domineering control, and when Menshikov fell ill, his court opponents seized the opportunity to turn the emperor against him. Peter also dissolved his engagement to Menshikov's daughter Maria.
Peter II is buried in the Cathedral of the Archangel at the Moscow Kremlin. He is the only post-Petrine Russian monarch given that distinction; all other post-Petrine rulers, except Ivan VI, were buried in the Peter and Paul Cathedral in Saint Petersburg.
Peter II was engaged to Ekaterina Alekseyevna Dolgorukova, arranged by the Dolgorukov family to tie themselves to the imperial line. He died of smallpox on the 30th of January 1730, which was the very day scheduled for their wedding.