Planet Media - This week's media news at a glance

- The missing owner of City AM, Leonid Rozhetskin, bought a false passport before he disappeared from his Latvian seaside home a month ago, according to Interior Ministry sources in Riga. His mother claims he had a business conflict with a senior official in the Russian government and was killed on an order from Moscow. - The Daily Telegraph, 14 April

- Carolyn McCall, chief executive of Guardian Media Group, has resigned as an independent director of Tesco after the supermarket group started legal proceedings against The Guardian and its editor, Alan Rusbridger, over allegations made by The Guardian concerning Tesco's tax affairs. - The Guardian, 14 April

- Helen Alexander is stepping down as chief executive of The Economist Group after more than a decade to take an advisory role at private equity group Bain Capital. She will retain her non-executive directorships at Centrica and Rolls-Royce. - Financial Times, 10 April

- Microsoft is rumoured to be on the verge of a collaboration with News Corporation as it continues to pursue Yahoo, which is, in turn, looking for help from AOL and Google to fend off a hostile takeover. At the same time, Google is testing its advertising systems on Yahoo's website, widely seen as an attempt by Yahoo to draw another key internet player into its camp. - The Guardian, April 11

- Google has hired former banking star Frank Quattrone as an adviser as the takeover battle for Yahoo rumbles through Silicon Valley. He was said to have generated as much as 15% of Credit Suisse's revenues during the tech boom and launched Qatalyst Group last month, a technology-focused investment banking boutique. - The Sunday Telegraph, 13 April

- Liberty Global, the international pay-TV business owned by US tycoon John Malone, is considering a bid for Virgin Media's TV channels. - The Daily Telegraph, 14 April

- TV channels that encourage viewers to call premium rate telephone lines for adult-themed chat may be forced off the air after a clampdown by Ofcom. The proposals would mainly affect 17 adult chat channels and one psychic TV channel, but could also affect Five, which still airs premium rate quiz shows. - Financial Times, 10 April

- Elisabeth Murdoch's independent production company, Shine, has struck a deal to distribute video content on MySpace, the social network owned by her father's company News Corporation. - The Daily Telegraph, 11 April

- Lachlan Murdoch has abandoned plans to buy Consolidated Media Holdings, owner of Australia's biggest commercial broadcaster, Nine Network, for £1.48bn, after his partners reportedly failed to agree on a price. - The Daily Telegraph, 8 April.

This article was first published on Media Week