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Charlie Sheen’s ex-wife Denise Richards can no longer take care of his twin sons by another ex-wife, Brooke Mueller, because of the little boys’ violent and chaotic behavior, Richards said in a heartbreaking letter to LA child-welfare authorities.

The 4-year-olds have become unhinged after increased visits with the drug-addled Mueller, the letter posted on RadarOnline states.

“With a heavy heart, I must inform you that I can no longer be Bob and Max’s caregiver,” Richards wrote to the LA Department of Children and Family Services. “Unfortunately, I have seen them get worse with increased contact with their mom.”

Richards had recently taken the boys in after officials removed them from Mueller’s residence.

In the letter, Richards describes in detail how the boys’ brutal actions increased after visits with their mother. Richards claims the tykes have gone into “zombie-like” states, beaten their dog, played with their own feces and have assaulted their half-sisters — Richards’ two daughters with Sheen.

The letter came to light amid a nasty custody battle between Mueller and Sheen over the boys and allegations of abuse.

Mueller has had various stints in rehab facilities.

Richards and Mueller are Sheen’s second and third wives, and he has a grown daughter from a relationship in the 1980s.