A man in his 30s died in custody after “feeling unwell” on Sunday morning, Wiltshire Police said.
The man had been in custody at Gablecross Police Station in Swindon since Saturday morning but died at around 9am on Sunday.
The incident is now being investigated by the Independent Office for Police Conduct (IOPC).
Superintendent Steve Cox said: “The man, who had been in custody since Saturday morning, became unwell this morning and was sadly pronounced deceased at around 9am.
“As a result, we have made a mandatory referral to the Independent Office for Police Conduct (IOPC), who are now investigating independently.
“It would not be appropriate to comment further at this time.”
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