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Hundreds of people have signed a petition demanding information about the murder of teacher Carl Davies.
More than 1,600 people have already backed the e-petition, set up by his sister Kerrie Stewart in just a week.
Mr Davies, 33, was killed on the French-administered Island of Reunion last year - and his family feel they are being "fobbed off" and want politicians to act.
An opening statement written by the married mother-of-one reads: "We want the government to help us all they can and not keep fobbing us off with 'we have no jurisdiction in their country'.
"French police can come here and conduct investigations into murder, but we can't go to France and do it. My brother was an ex-Royal Marine who fought for his country and is now being let down by his country.
"A beautiful man whose life was ended by brutal murder and we his family are being denied the right to grieve due to us having to fight his corner all because he was murdered abroad and we get no help by our government.
"To top it off we have to pay for answers out of our own pockets - this is wrong on every level."
Mr Davies, of Harrier Drive, Sittingbourne, who taught at Sittingbourne Community College, was murdered last November.
His parents Andy and Maria, from Harrietsham, were originally told he had died after falling into a ravine.
However, a week later they received news the ex-Royal Marine had been murdered.
Last week, Mr Davies senior (pictured above) accused the French authorities of having "double standards".
He made the statement after learning French detectives were allowed on to British soil to investigate the killings of three British citizens in the Alps.
He said the family were shocked by the news as they were told by the government that Kent police could not help the French with their investigations when their son was killed as they have no jurisdiction there.
He said: "I feel my family is being discriminated against, it's bias and it's racism in reverse. I'm not belittling the level of attention the family is getting. It's tragic and we understand how the family feel because we have suffered a loss too."