The family of G20 protest victim Ian Tomlinson have said they have been left frustrated by the police response to his death.
Mr Tomlinson, 47, died after he was struck with a baton and pushed to the ground by a police officer during G20 protests in London on 1 April.
At a review into how protests are policed, his stepson Paul King called for answers over what has been done.
Mr King said: "He was an innocent man on his way home."
The Metropolitan Police Authority's civil liberties panel held an open meeting at City Hall to hear opinions about how public protests are policed.
Mr Tomlinson's family said they were surprised the incident had not been part of recent inquiries into the protests.
At the meeting, Mr King, 26, of the Isle of Dogs, east London, said: "We have lost our dad."
He added: "[Former Met Commissioner Sir Ian Blair] made a comment that he was not the first and he would not be the last. So, are there going to be more violent assaults on other people?"
Addressing the Tomlinson family, Victoria Borwick, who chaired the meeting, said: "There is nothing any of us can say to reverse the situation of what happened last April. We are extremely sorry.
"We have invited people here today to give their first-hand experiences of G20 so hopefully through this process we can avoid tragic incidents happening again."
Representatives of environmental and personal freedom pressure groups attended the meeting, as well as protesters, solicitors and residents.
The panel heard a wide range of views from calls for police to wear football-style vests to make them easier to identify to first-hand accounts of violence.
After the meeting, Mr Tomlinson's widow, Julia, said: "We are just lost for words. We found today very hard."
The family's solicitor, Jules Carey, said they hoped a decision over whether to charge anyone over the incident "happened sooner rather than later".
A member of the Metropolitan Police's territorial support group has been suspended and questioned on suspicion of manslaughter over Mr Tomlinson's death.
Mr Tomlinson was a newspaper seller who was walking home past the protests when he was struck by the officer.
The officer was filmed by an amateur cameraman apparently hitting him with a baton and pushing him to the ground.
Two post-mortem examinations found the 47-year-old's death may have been due to a heart attack or abdominal bleeding.
In August, the Independent Police Complaints Commission passed a file on the death to prosecutors.