A fourth teenager has been arrested on suspicion of murdering a 19-year-old in South Croydon.

The 19-year-old was detained today by detectives investigating the fatal stabbing Andre Aderemi on the Monks Hill estate on Tuesday night.

Three teenagers have been charged with Mr Aderemi's murder.

Jamall Longergan of Woodcroft Road, Thornton Heath, Fabio Cela, of Fryston Avenue, Shirley and Rodney Mukasa, of Green View Avenue, Monk's Orchard, were charged on Friday night after their arrests earlier in the week.

The trio, all 19, appeared at Camberwell Green Magistrates' court yesterday.

They were remanded in custody to appear at the Old Bailey on August 23.

RELATED: Dozens of tributes left as estate mourns stabbed teenager Andre Aderemi

Mr Aderemi, who previously lived on the estate but recently moved to Chatham in Kent, was found bleeding to death in Heather Way at 7.40pm.

He was taken to taken to hospital but later died despite frantic efforts from members of the public to save him.

A post-mortem examination was scheduled to take place at Croydon mortuary on Thursday.

Family and friends of Andre, a former John Ruskin College and Oasis Academy Shirley Park pupil, gathered on Wednesday to lay flowers and light candles at the spot where he was found wounded.

They later held an emotional service St Francis Church on the Monks Hill estate.

His mother Yemi said the family had moved away from the estate to "get him out of this environment" and pleaded with young people to "stop the warring".

She told about 50 people gathered at the church: "I am just so sad that on this one time I wasn't there for him.

“I've always been there for him. He just had to call me and I'd have come.

"I don't know how I'm going to be the person that I have been before because Andre has been a huge part of my life. He is my rock."

RELATED: 'Stop the warring': Family's plea after teenager Andre Aderemi stabbed to death in Heather Way in the Monks Hill estate, South Croydon

Teddy bears and heartbroken messages have been left in Heather Way along with candles spelling “RIP Dee”, who was an aspiring rapper under the name Dee Rose.

Dan Morrow, Mr Aderemi’s former headteacher at Oasis Academy Shirley Park, paid tribute the teenager this week, describing him as a "truly kind and wonderful young man".

He added:“As his former headteacher, he was one of those students who you always remember - a natural born leader and full of potential.”

Anyone with information is asked to contact police on 101 or Crimestoppers anonymously on 0800 555 111.