A man in his early 60s died after being involved in a go-kart collision at a popular racetrack while celebrating his brother's birthday.
Allan Fairweather, from the Lowestoft area, is understood to have been at his brother's 60th when the tragedy unfolded.
Mr Fairweather was injured when two karts collided at the Ellough Park Raceway on Sunday afternoon. Everyone taking part was a family member, a statement from the family released by police said.
The occupant of the other kart sustained an arm injury.
The East of England Ambulance service said they were sent to the outdoor kart track following a report of a man being thrown from a go-kart at about 3.19pm on Sunday before police officers also attended.
Ambulance crews treated 'a man in his 60s who was unconscious and not breathing', at the scene.
A rapid response vehicle, two ambulance crews, the Essex Air Ambulance and Lowestoft police officers attended.
A spokesman for the East of England Ambulance Service NHS Trust (EEAST) said: 'We received a call at 3.19pm on Sunday to Benacre Road, Ellough, to a report of a man being thrown from a go-kart.
'Despite their best efforts, the patient sadly died at the scene. Our thoughts go out to his family and friends.'
A police spokesman said officers were alerted to an incident at Ellough Park Raceway in Benacre Road, Ellough, and they are now liaising with Waveney District Council as an investigation into the man's death takes place.
A council spokesman said: 'The investigation into the death of a man at a racetrack in Ellough at the weekend is being led by Waveney District Council's food and safety team, with assistance from Suffolk Police's Serious Collision Investigation Team.
'Suffolk Police were called by the ambulance service at 4.10pm on Sunday (September 25), reporting that a man had died following a collision at the track between two go-karts.
'Officers from Waveney District Council have undertaken a preliminary examination of the site and the investigation will be detailed and thorough.'
It is understood that the popular race circuit was hosting three private events and open hire kart sessions on the outdoor track on Sunday.
In a statement on its Facebook page, Ellough Park Raceway said: 'Police were called to Ellough Park Raceway at approximately 3.10pm on Sunday following a collision between two karts.
'It is with much sadness that a gentleman has passed away. Suffolk police are currently liaising with Waveney District Council and an investigation into the accident is taking place. Our condolences are with the gentleman's family at this time.'
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