Mark Kranz, the former CFO of Rupert Murdoch's Fox News Channel, was offered immunity from prosecution by government lawyers investigating allegations of payments made to women allegedly harassed for the network's former chairman Roger Ailes, Financial Times is reporting.

Kranz served as Fox News CFO from 2004 to 2016, and he left not long after the news organization's parent company 21st Century Fox (FOXA) - Get Report pushed Ailes out.

Ailes was fired after an internal investigation into claims he harassed former commentator Gretchen Carlson. Former Fox anchor Megyn Kelly, who famously sparred with President Trump during the prsidential campaign, alleges in her memoir that Ailes also harassed her.

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The U.S. Attorney's Office is looking into whether Fox News allegedly misled investors by hiding the many financial settlements with its former employees, the Financial Times noted.

Kranz's position as CFO gave him intimate access to the company's financial statements and his co-operation will help prosecutors to understand how the payouts were accounted for.