The incident on the tracks means that all lines between London Waterloo and Clapham Junction were closed, and major disruption is expected until the end of the day.
Lines have now reopened, but Network Rail are warning that trains still face being cancelled, delayed by up to 90 minutes or revised.
The incident means that services to other stations beyond Clapham Junction such as Wimbledon and Richmond have also faced major disruption.
A British Transport Police spokesperson said: “We were called to Queenstown Road railway station at 11.49am on 9 April to reports of a casualty on the tracks.
“Paramedics also attended and sadly a person was pronounced dead at the scene. This incident is not being treated as suspicious, and a file will be prepared for the coroner.”
:: If you are experiencing feelings of distress, or are struggling to cope, you can speak to the Samaritans, in confidence, on 116 123, email [email protected], or visit the Samaritans website to find details of your nearest branch.
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Live updates
Minor delays on the Jubilee line
Minor delays are affecting the Jubilee line while engineers work to fix a track fault at Bond Street.
Circle line update
Minor delays are affecting clockwise services on the Circle line due to train cancellations.
Circle line resumes good service
The Circle line is currently providing a good service.
Minor delays on westbound District line between Upminster and Barking
Minor delays are affecting westbound District line services between Upminster and Barking due to train cancellations.
The rest of the line is running normally.
Minor delays on the Central line
Minor delays are affecting the Central line between Leytonstone and Epping due to train cancellations.
The rest of the line is running normally.
Bakerloo line resumes good service
The Bakerloo line is currently providing a good service.
Windrush line resumes good service
The Windrush line is currently providing a good service.
Elizabeth line resumes good service
The Elizabeth line is currently providing a good service.
Severe delays on the Windrush line
Severe delays are affecting the Windrush line while engineers deal with a faulty train at Wapping.
Severe delays on the Elizabeth line between Maidenhead and Burnham after signal failure
Severe delays are affecting services between Maidenhead and Burnham while engineers work to fix a signal failure in the Maidenhead area.
The rest of the line is running normally.