Lewis Elwin was laid to rest two months after he was murdered today, as his family marched through Tooting in protest of knife crime.
Family and friends held placards urging teenagers and young people to choose life over the knife as they walked to his funeral.
Mr Elwin, 20, was stabbed on April 18. He collapsed after the attack in Penwortham Road at the junction of Thrale Road in Tooting, at about 3.47pm.
Tributes to him remain at the scene.
His brother Byron Douglas-Letts, said: "Everyone loved Lewis.
"We are dealing with it [life after his death] as a community.
"The police are doing everything they can and I am focused on my family and making sure this day is remembered for Lewis."
April 22: Lewis Elwin murder: woman used jumper to stem bleeding in last moments of 20-year-old's life
His brother Byron Douglas-Letts, said: "Everyone loved Lewis.
"We are dealing with it [life after his death] as a community.
"The police are doing everything they can and I am focused on my family and making sure this day is remembered for Lewis."
Mr Douglas-Letts said his brother had been "focused, determined and aspirational" before his death.
Today the family and friends of Lewis Elwin march against knife crime pic.twitter.com/Nj1TQBh3vX
— Rebecca Taylor (@wandsworthbecca) June 17, 2016
In the weeks before the tragic murder, the family had been together, times that Mr Douglas-Letts and his brothers speak highly of now.
He said: "We are grateful for that, it is a blessing.
"Everyone has lives to live but we need to be accountable and responsible for each other."
May 3: Man arrested on suspicion of murdering Lewis Elwin in Tooting
Mr Douglas-Letts and his family will now campaign and work with the council to stop future tragedies.
Mr Douglas-Letts said: "The mentality of society needs to change.
"Too many young people are followers and we need leaders.
"We all know how hard it is to find yourself, but there are different choices and opportunities.
"It is a new generation.
"They need guidance and mentors. Parents need to take accountability too and the government.
"It is not culture, it is human based."
Mr Elwin's step brother, Darren Douglas, is a youth worker in East London.
He criticised the lack of youth facilities and places for young people to go in the capital, and the rest of the country, and said that had an impact on the way young people grow up.
Mr Douglas said Mr Elwin had never spoken to him about why he carried a knife, but that he had been "turning his life around".
Rosena Allin-Khan, elected as MP last night, with the mayor of Wandsworth and councillor Candida Jones pic.twitter.com/lrsT0doQoM
— Rebecca Taylor (@wandsworthbecca) June 17, 2016
Speaking before the march, family friend Noel Williams praised the work of councillor Candida Jones, who he said had helped the family in recent weeks.
He also noted that the new MP for Tooting, Rosena Allin-Khan, had attended the march despite being elected less than 12 hours before.
He said: "I think she is taking knife crime quite seriously.
"She is on the frontline with us.
"I feel that Sadiq said it and we should give the man time, let him work on that pledge.
"I believe he wants to get it solved."
The family of Mr Elwin was joined by Mayor of London Sadiq Khan, and Dr Allin-Khan MP, as well as the Mayor of Wandsworth Richard Field at the funeral.
June 17: Detectives release fresh CCTV in Lewis Elwin murder investigation
At the funeral, held in St Boniface Church, mourners sang 'Make Me Your Channel of Peace' and 'How Great Thou Art'.
Passages were read from Psalm 23 and Matthew 5, and Telixia Inico, Omara Harrison and Reanna Elwin gave tributes.
Police released new CCTV footage on Friday afternoon, showing a car close to the scene at the time Mr Elwin was killed.
Detectives want to speak to anyone who was a passenger in the car to find out what they saw that day.
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