A man who had covered himself in petrol became a human fireball after police shot him with a Taser.
A police watchdog will investigate whether firing the weapon at Andrew Pimlott, 32, caused fatal burns.
Mr Pimlott suffered serious injuries in the incident in on the evening of April 18.
He was taken to hospital and subsequently transferred to the specialist burns unit at Frenchay Hospital in Bristol where he died five days later.
The Independent Police Complaints Commission (IPCC) said two Devon and Cornwall Police officers responded to a 999 call from a caller who said that Mr Pimlott was in a garden with a can of flammable liquid.
Shortly after the police arrived he sustained serious burn injuries and an ambulance was called.
An officer deployed a Taser during the incident in Honicknowle, Plymouth, the watchdog said.
IPCC Commissioner Sarah Green said: “My condolences go to Andrew’s family and friends for their loss.
“This must be a very difficult time for them and we have appointed a family liaison manager who is ensuring the family are kept informed.