Denise Richards is desperate for her bitter ex-husband Charlie Sheen to visit a mediator with her because she fears the former couple's silence is unhealthy for their daughters.

The actress admits she and her ex "don't speak at all," and all the nastiness that came out during their "awful divorce" is still ever present. But her feelings towards Sheen hit a new low when the actor refused to join his ex and their children at the memorial for his late mother-in-law, who lost her battle with cancer in November. And he had no time to visit Richards' dying mother.

She says, "He said, 'I hope you die with her.' It was awful. That's (the kids') nana; my mom was the closest person to my girls after myself and Charlie. It's sad."

And after claiming Sheen cut off her child support last week because "he doesn't want my kids to have vaccines and shots," Richards insists it's time for the former couple to put their differences behind them for the sake of their daughters.

She adds, "It's a very conflicted divorce (and) it's not healthy for the children. I've tried to see if he (Sheen) would see a mediator and just put our stuff aside... This is about the girls, but there's nothing."

Richards reveals Sheen is so determined to have absolutely no contact with his former wife, he doesn't even pick his daughters up when it's his turn to have custody of them.

-Charlie Sheen Pictures
-Denise Richards Pictures

(This news article provided by World Entertainment News Network)