The mother of Jim Carrey's ex Cathriona White has filed a court complaint accusing the actor-comedian of reneging on his offer to pay for her daughter's funeral.

White died in 2015 after a fatal overdose of drugs.

White's mother Brigid Sweetman and White's ex-husband Mark Burton filed an amended complaint in their wrongful death lawsuit against Carrey in the Superior Court of California, county of Los Angeles, on Monday, doubling down on their funeral claim, despite Carrey's lawyer ordering it be removed from their complaint in court papers filed in December last year.

The filing says that Carrey wanted to play the "grieving good guy" when he showed up at White's funeral, but actually "never paid a dime of funeral expenses" and "reneged on his offer" after learning White had left her family a "minimal amount of money".

Carrey's lawyer, Marty Singer, has called the lawsuit a shameless shakedown and says his client is blameless. 

Carrey filed legal documents on December 19 last year demanding that the court should strike claims from Sweetman's lawsuit. He said the allegations she included were made for the sole purpose of harassing, embarrassing and humiliating him in an effort to shame him into an unmerited settlement.

The actor says that the statements regarding claims that he gave White STDs without warning, called her a "whore" and used "fixers" to silence her are "irrelevant" to the wrongful death case.

"A part of their attempt to shakedown Carrey for a multi-million dollar payday, Sweetman and her attorney have riddled the complaint with severe ad hominem attacks and allegations about STDs, none of which are relevant to the cause of death," court documents say. 

By having the claims struck from the lawsuit, Carrey will not have to prove that he did not give White STDs without warning, among other allegations.

He says in court documents that he and White were a loving couple and that he was "absolutely devastated" by her suicide on the third anniversary of her father's death on September 28, 2015.

Carrey specifically points to two of White's suicide notes that she left him, saying that the letters show how much she loved him.