Former BBC chief explains dropped Savile investigation

The former director general of the BBC, in a letter to a British lawmaker, tried to explain what he knew about a journalistic investigation into claims of abuse by Jimmy Savile, a late children's TV presenter.
A slew of sexual abuse allegations against Savile, a BBC star and household name in Britain, have emerged over the past month. A second scandal broke with the news that the BBC show "Newsnight" had been investigating similar allegations but dropped the case in late 2011.
This week, Mark Thompson, who was...