Denise Richards has accused her ex-husband Charlie Sheen of hitting "an all-time low" after telling her to "die of cancer".

The actress claims Sheen told her to "rot in hell" when she sent him a text message to say their daughter Sam was ill.

Richards tells New York gossip column PageSix, "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.

"His response was, 'I hope you and your worthless retarded father get cancer and join your stupid mom. Rot in hell you whore.' 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?"

Sheen and Richards took their bitter ex-marital battle to breakfast TV screens on Wednesday, when they clashed over an email the actress allegedly sent begging for a sperm donation from her ex-husband.

But Richards denies sending the email. She adds, "I don't want Charlie's prostitute-tranny-infested sperm. I have two beautiful kids. We'll leave it at that. I am so over him. He's the one who can't move on. He's disgusting and he's hit an all-time low."

Meanwhile, Sheen has challenged Richards to take a lie detector test - on live TV.

A spokesman for the star says, "Denise seems to be denying the existence of (the) e-mail. This goes beyond a he-said-she-said. We have an offer from a (live) TV show. They will bring a computer expert to diagnose the e-mail and to verify it was sent by her e-mail address and to verify it was neither altered nor edited. Computer DNA - it is conclusive.

"The only time Charlie has spoken on TV about her, they were sound bites at red-carpet visits or during set visits. He has not gone on multiple TV shows this week."

- Denise Richards Pictures
- Charlie Sheen Gallery
- Charlie Sheen & Denise Richards' Sperm War Rages On

(This news article provided by World Entertainment News Network)