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Sri Lankan police today arrested a retired Deputy Inspector General who became the second senior police officer to be held for the killing of a leading newspaper's editor and a vocal critic of former president Mahinda Rajapaksa, officials said. Lasantha Wickrematunga, the founder and editor of the Sunday Leader, was waylaid by some unidentified bike-borne assailants who gunned him down in the Colombo suburb of Ratmalana in January 2009.