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Lucius Malfoy: " How should I know how the stupid little girl got hold of it?" Harry Potter: " Because you gave it to her. Riddle used the girl's death to create his first Horcrux, Tom Riddle's Diary, but he did not want his work forgotten, so later in his life, he planned with Lucius Malfoy that the diary makes its way back to Hogwarts, where it could finish Salazar Slytherin's work. Hagrid was expelled but allowed to remain as Gamekeeper, because the Transfiguration professor, Albus Dumbledore, did not believe him to be guilty.
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He chose third year Gryffindor Rubeus Hagrid, who had a reputation already and took the information to Professor Dippet, the Headmaster. Not wanting to return to the Muggle orphanage from which he came, Riddle decided that he needed a patsy. Finally, late in the school year, Myrtle Warren was killed, and the Headmaster threatened to close the school unless the culprit was apprehended. Throughout the 1942-1943 school year, a series of Muggle-born students were petrified. Having come to believe in fanatical pure-blood supremacy, Riddle planned to use the " terror within" the chamber to rid the school of those "unworthy" to learn magic that is, Muggle-born wizards and witches.
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Riddle took some time to research his famous ancestor and in his fifth year, he found the fabled Chamber of Secrets. Young Hagrid is framed by Tom Riddle for opening the chamber After discovering this, he turned his attention to his mother's family and found the Gaunt line, direct descendants of Salazar Slytherin himself leaving near Little Hangleton. However, his search was fruitless, as Tom Riddle Snr had never set foot in the school. Believing death to be the realm of the weak, he initially believed his mother could not have been magical, given her death, and the young Tom focused on finding his father among the records at Hogwarts School of Witchcraft and Wizardry. He was an odd boy and discovered in his eleventh year that he was a wizard. On New Year's Eve, 1926 Tom Riddle was born to the pure-blood witch Merope Gaunt in a London orphanage. Enemies of the Heir, beware." - One of the messages on the walls of Hogwarts Castle " The Chamber of Secrets has been opened.
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