Wojciech Janowski, a 64-year-old who served as Poland's honorary consul in Monaco, was charged for last month's killing of 77-year-old Helene Pastor, Marseille prosecutor Brice Robin told a news conference.
Robin said Janowski had spent 272,000 USD in cash and 50,000 euros worth of presents to stage the contract killing.
Robin said Janowski's motive was to "lay his hands on the heritage" of his partner Sylvia Pastor, Helene Pastor's eldest daughter. He said Sylvia Pastor felt "betrayed" by the affair.
Poland announced today that Janowski had been stripped of his title of honorary consul "because of the loss of the irreproachable reputation that is essential for this role".
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"In the present circumstances there can be no question of trust," the foreign ministry said in a statement, noting that the post of honorary consul "grants neither diplomatic immunity nor individual privilege".
Janowski has been in custody since Monday, when he was arrested along with 22 others by police investigating the shooting of Pastor multiple times with a sawn-off shotgun as she was leaving a hospital in the French Riviera city of Nice.
Janowski's partner Sylvia was also detained for questioning but was released yesterday without charge. Ten others were released on Wednesday.
Robin said earlier that police had identified two suspects alleged to have been hitmen hired to kill Pastor.
The two men, a 31-year-old and a 24-year-old originally from the Comoros islands and living in Marseille's rough northern districts had been identified as being "present at the location of the killing".
They were found thanks to surveillance cameras, mobile telephone records and traces of DNA discovered in a Nice hotel where they stayed on the day of the killing.