When Carshalton man Matt Boylan was walking through Mitcham Junction, the last thing he expected to do was help arrest a suspected attempted murderer.

But on Monday, July 23, that's exactly what happened.

"I was coming home from work and got stopped by some geezer who asked me to call the police," Mr Boylan said.

"So I dialled 999 and asked what the emergency was.

"He kept saying 'I climbed, I climbed."

But what the man told him next shook Mr Boylan to his core.

"The police picked up and suddenly the man started saying 'I killed someone' over and over again.

"I was like 'oh my god'."

The 29-year-old was then told to start questioning the man as they stood on the corner of Mill Green Road and London Road.

"Then he admits to where the body was and it was somewhere near Streatham," Mr Boylan said.

"All I could think was 'I'm talking to a murderer and I've helped arrest him.

"Some people wouldn't believe me if I told them...I couldn't believe it."

So at about 10.30am the Met Police showed up and took the suspect away.

A spokeswoman for the police said: "A man has been charged following a serious assault in Streatham Vale.

"A 33-year-old man of no fixed address, was charged on Tuesday, July 24 with attempted murder.

"He will appear in custody at Camberwell Green Magistrates' Court later today (July 25)."