Tekken 6 Storyline
Christie was unable to win The King of Iron Fist Tournament 5. She was struggling to discover a way to save her grandfather when Eddy Gordo, who had been loyally by her side, suddenly vanished without a trace. She searched everywhere for Eddy, but she was unable to find him. Ultimately, Christie was left with no choice but to return to Brazil alone.
Christie continued her search for Eddy when she returned to Brazil. Surprisingly, her grandfather also disappeared from the hospital, allegedly sent to the Mishima Zaibatsu for treatment. Christie figured that Eddy's disappearance was somehow connected with the Mishima Zaibatsu, as well, but she couldn't put it all together. When The King of Iron Fist Tournament 6 was announced, Christie headed for Japan to get in contact with the Mishima Zaibatsu and to gather clues about the disappearance of Eddy and her grandfather.
Source: tekken.namco.com
Tekken 5 Storyline
Source: Tekken 5 Manual
Tekken 4 Storyline
Christie shared her grandfather's talent and became a formidable fighter on a par with Eddie himself. However, soon after Christie's graduation, Eddie disappeared, telling her only that he was going to avenge his father's murder, having identified Kazuya Mishima as the culprit. Looking for clues as to where Eddie had gone, Christie found a newspaper clipping about the King of Iron Fist Tournament 4 and set off to follow him.
Source: Tekken 4 Manual

