Police Scotland are investigating but the death is not being treated as suspicious.
Four Still In Hospital After Rollercoaster Crash
Four people remain in hospital as the investigation into the cause of a theme park rollercoaster crash continues.
Two boys, aged 11 and 12, are still said to be in a serious condition with chest, leg and arm injuries at the Royal Hospital for Children in Glasgow after the Tsunami ride derailed and hit the ground at M&D's amusement park near Motherwell, North Lanarkshire, on Sunday afternoon.
Two others are in a stable condition in Glasgow hospitals.
In total, ten people were treated at hospitals in Glasgow and Lanarkshire after the crash but most have now been discharged.
The theme park remains closed, with police, engineers and the Health and Safety Executive (HSE) inspecting the ride and the five gondolas that fell 20ft to the ground from the rollercoaster.
M&D's said the Tsunami ride had been closed on Saturday due to a "minor electrical fault'' but was ''fully operational'' when the park opened on Sunday.
Director Douglas Taylor said his thoughts were with those injured and that he was "devastated'' at the first such accident in 50 years in business.
The crashed carriages narrowly missed people on the ground below the Tsunami.
Amy Thomas said debris from the crash narrowly missed hitting her three-year-old son Dylan, who was playing on a toddlers' ride below the rollercoaster.
She said: "The rollercoaster above went to turn a corner but it didn't quite make it, bits started cracking off and then it just fell.
"The front carriage broke off and pieces were bouncing to the ground.
"Luckily there was a fence surrounding the toddlers' ride which bore the brunt of the falling debris, but pieces of it landed two feet from him.''
Police, firefighters and paramedics rushed to the scene as several visitors posted images on social media appearing to show a mangled carriage on a pathway surrounded by dozens of people.
According to the M&D's website, the Tsunami can go at speeds of up to 40mph through corkscrew turns and loops.
It is not the first time the park has had problems with its rides, including Tsunami. In July 2011, nine passengers, including children, were stranded for more than eight hours when it came to a halt 60ft above the ground.
In March, eight people had to be rescued by firefighters in a cherry picker after the Tornado rollercoaster stopped working around 20ft off the ground.
Police Scotland says the theme park will remain closed while the joint investigation into the cause of the crash is carried out.
Anyone who witnessed the incident, captured footage or took photographs is urged to contact the force by calling 101.
HSE principal inspector Barry Baker said: "We have brought HSE specialists in mechanical engineering to the site to begin the process of finding out what caused the gondolas to come off the rails.
"HSE will work very closely with colleagues in the police as the investigation unfolds.''
The crash happened on the A92 in Fife at about 4.30am on Monday.
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The SNP leader is hoping to build on her party's 2015 success of winning a record 56 out of 59 Scottish Westminster seats.
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