Dan Penteado's legal team said he committed the fraud because he was on a short-term contract and made the "very poor judgment not to interrupt the flow of housing benefit".
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The 53-year-old was killed shortly after leaving her home in Mosta, Prime Minister Joseph Muscat said.
Jordi Sanchez of the Catalan National Assembly and Jordi Cuixart of the Omnium Cultural group were jailed on Monday.
Storm Ophelia continues to bring strong winds to western parts.