The 40-year-old star reportedly died following an accident at work on Wednesday.
Essex Police said: “As part of our ongoing investigation into the death of a man in Campfield Road, Shoebury, on Wednesday 27 March, a man aged in his 40s from the Witham area was arrested on suspicion of gross negligence manslaughter.
“He has now been released under investigation.
“This is a joint investigation with the Health and Safety Executive and our enquiries are ongoing.”
Police previously said they were called to an incident in Shoebury at around 10am on Wednesday after “a man who was working at height had fallen and sustained an injury”.
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Gilbey was best known for appearing on the Channel 4 show alongside his mother Linda McGarry and stepfather Pete McGarry, who died in 2021 aged 71.
The family first appeared on the second series of Gogglebox in 2013 but were dropped the following year when the reality star signed up for the 14th series of Celebrity Big Brother in 2014, reaching the final.
Gilbey appeared on the Channel 5 version of the show alongside other famous faces including The Hills star Stephanie Pratt and American actor Gary Busey, who won the series.
The family later returned to Gogglebox and a spokesperson for the award-winning programme said: “George was part of the Gogglebox family for eight series alongside his mum Linda and stepdad Pete.
“Our thoughts and deepest condolences are with Linda and George’s family and friends at this very sad time. The family has asked for privacy.”