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He was found collapsed and unconscious in his cell today after suffering serious head wounds, according to The Sun.
The Met said: "The suspect was taken to a hospital for treatment to a head injury sustained while in custody.
"He has since been discharged and returned to custody. We are not prepared to discuss further."
The Independent Office for Police Conduct (IOPC) says it has launched an investigation after receiving five referrals from the Met Police in relation to its handling of the case.
The watchdog will examine how officers responded after receiving a report that a man had exposed himself at a fast food restaurant in south London on 28 February - three days before Ms Everard's disappearance.
The other referrals were over the arrest of a serving officer on suspicion both of kidnap and murder, and the earlier allegation of indecent exposure; the Met's actions after Ms Everard was reported missing; and the injury of the suspect while in custody.