Denise Richards has had it with her ex-husband Charlie Sheen. Long after their volatile split, she claims that he won't stop texting her abusive messages. "Last week, I sent Charlie a text message asking him if he's going to Family Day [for daughter Sam's school] and letting him know Sam was sick with a cold," she tells the New York Post today. "His response was, 'I hope you and your worthless retarded father get cancer and join your stupid mom. Rot in hell… ' My mom died of cancer. This is what I deal with on a weekly basis. He missed Dad's Day at the school and my father had to go in his place. And this is how he talks to me?" Denise is firing back after Charlie released comments to the Post's Page Six column yesterday, calling her "beyond desperate." As for the title of Denise's new E! reality show, It's Complicated, she's not kidding!