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
Metropolitan line update
Minor delays are affecting the Metropolitan line between Moor Park and Amersham due to train cancellations.
The next southbound service is not expected until 08:17am.
The rest of the line is running normally.
Burnham and Taplow westbound trains suspended after signal failure
Westbound trains are not stopping at Burnham or Taplow due to a signal failure, while eastbound services are calling as normal.
Passengers wishing to get off at either station are advised to travel to Maidenhead and change for an eastbound service.
Minor delays on the Bakerloo line
Minor delays are affecting the Bakerloo line due to train cancellations.
Minor delays on clockwise Circle line services due to cancellations
Minor delays are affecting clockwise Circle line services due to train cancellations.
The rest of the line is running normally.
Minor delays on the Metropolitan line
Minor delays are affecting the Metropolitan line between Uxbridge and Harrow-on-the-Hill due to train cancellations.
Services on the rest of the line are running normally.
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Severe delays on the Circle line
Severe delays are affecting the Circle line following an earlier trespasser on the tracks at Stepney Green.
Hammersmith and City line update
There is no service on the Hammersmith & City line between Barking and Liverpool Street due to a points failure at East Ham.
The remainder of the line is facing severe delays. Tickets are being accepted on London Buses, the Mildmay line, DLR, Elizabeth line, c2c and South Western Railway services via any reasonable routes.
District line part-suspended in two sections with severe delays across rest of route
There is no District line service between Turnham Green and Ealing Broadway due to a points failure at Ealing Broadway, and no service between Tower Hill and Barking because of another points failure at East Ham.
Severe delays are affecting the rest of the line. Tickets are being accepted on London Buses, the Elizabeth line, DLR and c2c services via any reasonable route.
Piccadilly line update
Minor delays are affecting the Piccadilly line between Acton Town and Uxbridge as engineers deal with a points failure at Ealing Broadway.
Services on the rest of the line are running normally.