The turmoil continues for Sumner Redstone. According to the Los Angeles Times, a former girlfriend of the 92-year-old billionaire, who is chairman of both Viacom Inc. and CBS Corp., has alleged that Redstone’s signature was forged and that the mogul is being manipulated by Viacom’s chief executive.

Manuela Herzer, Redstone’s former girlfriend, recently filed a lawsuit to contest recent changes that removed her from a position of power in Redstone’s life and in his legal documents.