NEW YORK (AP) — CBS says media mogul Sumner Redstone has resigned as chair of the company's board, replaced by the company's CEO, Leslie Moonves.

The company says Redstone's resignation took effect Tuesday and he now serves as chairman emeritus.

He remains the executive chairman of Viacom.

The 92-year-old's health and mental capacity have been at the center of a months-long court fight.

Redstone's ex-girlfriend and longtime companion Manuela Herzer has raised issues about his decision-making capacity after she was expelled from his house in October. Herzer was previously in control of Redstone's care until their split.

She contends that Redstone is unable to speak and cannot meaningfully engage in decision-making about his medical care or other topics.