Relatives of Jean Charles de Menezes have laid flowers at the Tube station where he was shot by police who mistook him for a suicide bomber.
Floral tribute were laid at Stockwell Tube station
Three of his cousins visited Stockwell station in south London on the six-month anniversary of his death.
The 27-year-old Brazilian electrician was killed the day after the failed 21 July London bombings.
A minute's silence was held by family and friends returned later on Sunday for a public vigil and speeches.
Relatives of Azelle Rodney and Harry Stanley, other victims of police shootings, also attended.
After the minute's silence, Asad Rehman, family spokesman, said they had felt "kept in the dark" over the recent Independent Police Complaints Commission (IPCC) report, which has been released to the Crown Prosecution Service (CPS) but not to the family.
"Six months ago Jean, a young man, was on his way to work when he died in such horrific circumstances, gunned down in this Tube station," he said.
"Today is very much about marking and commemorating his death but also affirming their desire and commitment to seek justice and make sure that Jean will not be forgotten and there will be no cover-up and we will get to the truth."
On Thursday, the investigators handed their report to the CPS to consider if charges should be brought.
There are a total of 30 witnesses to the shooting and 600 statements were taken during the course of the inquiry by the IPCC.
Mr Menezes' family want charges brought against senior officers and those who pulled the trigger, saying they "cannot forgive".