Ian Tomlinson, a newspaper seller, was not taking part in the protest
The widow of G20 protest victim Ian Tomlinson has called for a full investigation into his death.
Julia Tomlinson said at a candlelit vigil on Tuesday that the family would never give up until they had answers about the death of her late husband.
Mr Tomlinson, 47, died after he was pushed to the ground by a police officer during clashes at a meeting in London of political leaders on 1 April.
Mrs Tomlinson said: "All we want is a proper investigation."
She added: "We will not give up until we get it."
She said it had been "a long and emotional time for us all as a family" as they prepared for their first Christmas without Ian.
The Tomlinson family has lodged a fresh complaint with the Independent Police Complaints Commission (IPCC).
They have claimed a senior Metropolitan Police (Met) officer misled those investigating his death, as part of a "cover up".
Mr Tomlinson's stepson Paul King said the unnamed officer alleged Mr Tomlinson fell to the ground, whereas he was allegedly struck by an officer and pushed to the ground.
Mr Tomlinson, a newspaper seller, was not taking part in the protest.
The IPCC is also investigating the death and the information released to the media by police in the hours afterwards.
A member of the Met's territorial support group was suspended and questioned on suspicion of manslaughter over Mr Tomlinson's death.
He was caught by an amateur cameraman apparently hitting Mr Tomlinson with a baton and pushing him to the ground.
A file was passed to the Crown Prosecution Service at the beginning of August by the IPCC.