Elon Musk will not testify on ex-girlfriend Amber Heard’s behalf in her defense of a $50 million defamation lawsuit brought by Heard’s ex-husband Johnny Depp. The "Pirates of the Caribbean" star filed the suit after the actress wrote an op-ed in 2018 saying she was "a public figure representing domestic abuse." She did not name Depp, but his lawyers argue that it's a reference to Depp since she has previously claimed he was physically violent toward her during their marriage. (Getty Images) Musk’s attorney, Alex Spiro, confirmed to Fox News Digital that the Tesla boss will not take the stand despite being listed as a witness.