Andrea Gross, the mother of DJ AM, has filed a wrongful death claim against Learjet and others involved in the late celebrity DJ's September 2008 plane crash, according to court documents obtained by People.

Gross added the new claim to the previous $20 million lawsuit filed by DJ AM, whose real name is Adam Goldstein. The suit, filed against Learjet (the plane manufacturer), the pilots' estates and others, claims that the plane crash ultimately led to Goldstein's death, according to the court documents.

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Goldstein died on Aug. 28 at the age of 36. Toxicology reports showed that his death was an accidental overdose caused by the combined effects of cocaine, Oxycodone, Hydrocodone, Ativan, Klonopin, Xanax, Benadryl and Levamisole.

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Many of Goldstein's friends have suggested that the former drug addict relapsed due, in part, to the private jet crash, which left Goldstein and Blink 182 drummer Travis Barker with serious burns.

Inter Travel & Services, Inc., the owner of the jet and the charter company that managed its flights, filed suit against Columbia Metropolitan Airport, Learjet and Goodyear Tire for the crash earlier this year. A trial has been set for March 2, 2010.'s calls to reps for Goldstein's estate were not immediately returned .