Dean Cariss, 52, was struck by a moving car on a rollercoaster at Ocean Beach Pleasure Park in South Shields on March 19, 2023.
He died in hospital 13 days later.
An investigation by the Health and Safety Executive (HSE) found that Premier Attractions Limited had not ensured the health and safety of employees.
The company pleaded guilty and was fined £28,000 at South Tyneside Magistrates Court on December 17, 2024.
Mr Cariss, who had been with his partner Helen Wright for more than 15 years, was a stepfather to her three grown-up children and a step-grandparent to nine.
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In a statement to the court, Ms Wright said: “Dean had a fantastic relationship with my kids.
“He also idolised his grandchildren, and treated them like his own.
“He was bubbly and fun and would do daft things with them.
“He was very generous and liked to help people.”
Mr Cariss had also acted as Ms Wright’s carer for several years.
She added: “My whole life has been turned upside down and back to front.
“He would move heaven and earth for me.
“He was a big personality and I miss the fun and laughter.
“Silence is deafening when I am in the house on my own.
“Everybody fell in love with him when they met him. There was no serious side, just laughter and fun.”
The HSE investigation found that Premier Attractions Limited had not carried out a suitable and sufficient risk assessment and had not put proper controls in place to prevent employees from accessing dangerous areas while the ride was operating.
Premier Attractions Limited, of Little Hulton, Manchester, pleaded guilty to failing to comply with section 2(1) of the Health and Safety at Work Act 1974 and were fined £28,000 and ordered to pay £5,976 costs.
HSE Inspector William Gilroy said: “This tragic incident led to the avoidable death of a caring, family man.
“Dean’s death could easily have been prevented if his employer had acted to identify and manage the risks involved, and to put a safe system of work in place.”