Jagger broke the story about the Mirror share-tipping scandal while a reporter a City reporter at the Daily Telegraph. She then took up an offer from Daily Mirror editor Piers Morgan to edit its City page.
After more than two years on the tabloid, she is to leave to take up a job at Rupert Murdoch's News International-owned The Times as deputy news editor of its business section.
The Slickergate story, as it became known, cost The Mirror's two financial journalists, Anil Bhoyrul and James Hipwell, their jobs in February 2000 after they were exposed for buying shares in companies they were tipping to their readers on the City Slickers page.
The scandal nearly cost Morgan his job as well, when he was revealed to have been buying shares that were tipped by the City Slickers journalists. In particular, he bought a large number of shares in PC firm Viglen shortly before the firm was promoted by the City Slickers.
Morgan was finally cleared of any wrongdoing by an internal inquiry, but the black mark has hung over him over the last two years. It could now all come back to haunt him as the Department of Trade and Industry continues its own investigation into the activities at the Mirror and whether it constituted insider dealing.
Since Bhoyrul and Hipwell's departure, City Slickers has been renamed Financial Mirror. Jagger, who had been a stock market reporter on the Telegraph, started her career on the Telegraph's personal finance section.
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