Ronnie's older brother Pinto told ITV London that the family are trying to get on with their lives with difficulty, knowing Ronnie's killer is still free.
"Ronnie was taken away from us after having been fatally shot in the stomach, from cross fire whilst attending the funeral of a childhood friend. We have been stopped from getting on with our lives as his killer still has not been brought to justice." he said.
"Whilst Ronnie is no longer with us, his killer is able to walk the streets freely. He is still able to enjoy his friends and family, whilst my little brother is dead. What's more, his killer is still able to do what he did to Ronnie and put others through what we are going through."
More top news
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.