Detectives investigating disorder following an illegal rave in Croydon have released eight new images of people they would like to trace.
The images are of people who were in and around the site of the rave at a disused sorting office in Cherry Orchard Road in the early hours of Sunday, June 15.
Rio was a star of the Thames Valley Harriers based in Wormwood Scrubs' Linford Christie Stadium and was a star pupil at Holland Park School
He had gone with a group of his friends when he collapsed at the rave and died in hospital on Monday, June 16.
A 19-year-old also taken ill at the rave has now been discharged from hospital.
So far, a total of 20 people have been arrested in connection with the event, nine of whom were arrested during the rave.
Two men have been charged. A 21-year-old was charged with violent disorder, drugs offences and assault on police and a 25-year-old with violent disorder and drugs offences.
South Area Commander Simon Letchford, said: "I am appealing for anyone who recognises these people, or has information about the disorder, to come forward and speak to police.
"The behaviour of some of those attending this illegal rave and the direct attacks on officers who were there to maintain public safety is completely unacceptable. Twenty people have now been arrested and I would like to thank the public for their support.
"I am particularly keen for anyone who took images or video on mobile phones of the events in and around the area to provide these to police. They may contain vital evidence to help track down those responsible for this violence."
A 47-year-old man and a 30-year-old man were given adult cautions for possession of Class A drugs.
Three men were arrested on suspicion of money laundering, a 17-year-old boy was arrested on suspicion of violent disorder and a 22-year-old man was arrested on suspicion of criminal damage. All five have been bailed pending further enquiries.
Police made five further arrests on Friday, June 27 for handling stolen goods and criminal damage offences in connection with the investigation. All five men have been bailed pending further enquiries.
Two further arrests have been made for violent disorder. The two men have been bailed pending further enquiries.
Four arrests have been made, two on suspicion of violent disorder and two arrested on suspicion of criminal damage. All four have also been bailed pending further enquiries.
Anyone with footage of the night can send it to police via firstname.lastname@example.org.
Anyone with any information about the people pictured is asked to contact the Public Order Investigations Team on 020 8246 0076 or Crimestoppers anonymously on 0800 555 111.