Nisu ni Mata Harici dokazali špijunske aktivnosti, a strijeljali su je:
Trial and execution
On 13 February 1917, Mata Hari was arrested in her room at the Hotel Elysee Palace, on the Champs Elysee (now the HSBC French headquarters), in Paris. She was put on trial, accused of spying for Germany and consequently causing the deaths of at least 50,000 soldiers. Although the French and British intelligence suspected her of spying for Germany, neither could produce definite evidence against her. Secret ink was found in her room, which was incriminating evidence in that period. She contended that it was part of her make-up.[12] She wrote several letters to the Dutch Consul in Paris, claiming her innocence. "My international connections are due of my work as a dancer, nothing else [...]. Because I really did not spy, it is terrible that I cannot defend myself."[13] She was found guilty and was executed by firing squad on 15 October 1917, at the age of 41.
Feminist author Pat Shipman's biography Femme Fatale claimed that Mata Hari never was a double agent, but was used as a scapegoat by the French military authority to obscure the failing of the French military operations at the front.