Mata Hari actually met her lawyer Clunet prior to the start of World War I.
Georges Ladoux died on July 7th, 1933. There is no documentation of his being murdered.
Vladimir Masloff denounced Mata Hari while she was in police custody, and by the time of her execution he was back in Russia during the revolution. He later married a French Russian woman in Paris in 1919 and they both left for Russia afterwards. They disappeared from official records after that.