Dr Luke has now turned his attention to taking Kesha's mum, Pebe Sebert, to court.
After Kesha dropped abuse allegations last month, her former producer is now filing another lawsuit against her mother as she has apparently "continued to publicly defame" him.
"After we originally filed suit against Pebe Sebert, she continued to make outrageous, false and defamatory statements against Dr. Luke in her widespread media campaign to damage and smear his name," Dr Luke's lawyer Christine Lepera told People.
"Pebe Sebert's lawyers flat out refused to allow us to add those statements to the existing case or to toll the statute of limitations on them - so we've been compelled to file an additional action."
Kesha's mum's contentious statements listed in the suit include a 2015 tweet saying: "Kesha can't legally put out music unless she makes it under complete control of a man who raped her at 18."
Only in February this year, lawsuits against Pebe Sebert and her alleged smear campaign against Dr Luke were dismissed.
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Her lawyer Alex Little said in another statement that this was the producer's second "effort" to sue "a mother for publicly supporting and believing her daughter about being raped".
"It's also a transparent attempt to delay the trial of these issues," they continued. "Mrs Sebert looks forward to presenting her case to a jury as soon as possible. When the evidence is made public, she expects the jury will conclude that all of her statements have been justified."
Dr Luke has emphatically denied all of Kesha's accusations of sexual abuse and professional sabotage through his lawyers.
Aside from a guest appearance on Zedd's 'True Colors' in April, Kesha has been blocked from releasing any new music since she sued former mentor Dr Luke two years ago.
