Detectives have given details of the route and appearance of a suspect and released a picture of a bag they want to locate.
Troy Ramsundar, 34, was stabbed to death on Brixton Road on March 20, leaving his family “inconsolable and are trying to understand why he was killed”.(Image: Met Police)
A 30-year-old man from Croydon has since been charged with murder.
Detective Chief Inspector Brian Howie, from the Met’s Specialist Crime Command, who is leading the investigation, said: “My team continue to support Troy’s family who are inconsolable and are trying to understand why he was killed
“While we are making significant progress in our investigation, we continue to appeal for anyone who witnessed this incident and particularly anyone who has information about the bag and its contents to contact us.
“Did you see Troy that evening? We believe that he was selling packets of crisps in the area, including to people at the bus stop.
“This may seem like an insignificant detail but we are hoping it may jog people’s memories.
“My team are working tirelessly to piece together the events that took place on the morning of Thursday, 20 March. 
“They will be conducting a witness appeal at 04:00hrs tomorrow in Brixton Road on the two-week anniversary of Troy’s death.
“Please speak to them and share any information you may have. Help us to provide Troy’s family with the answers they need.”
Detectives believe a suspect then entered Brockwell Park from the Brixton Water Lane entrance at 5:15am on March 20 and left by the junction of Norwood Road and Dulwich Road after about 30 minutes.
Detectives are trying to find a blue Herschel rucksack with brown strapping and a pink or orange striped lining.
The backpack belonged to the suspect and it is believed he may have discarded it in or around Brockwell Park.
The suspect was wearing and may have also discarded a dark outer jacket, light (possibly grey) hooded top, dark face-mask, dark trousers, dark shiny shoes and gloves (possibly red or brown).
Detectives are also keen to speak to anyone who was at the bus stop on Brixton Road, stop Q, between 4.30am and 5:15am on March 20.
This bus stop is served by the 2, 3, 196, 415, 432, N2 and N3 buses.
