The Independent Office for Police Conduct (IOPC) previously prepared a report which concluded that officers failed to properly investigate an assault by Calocane.
The IOPC said it was appealing for witnesses after Adam Tidman, 34, died in hospital two weeks after the incident at Belushi's Bar in Southwark, south London on January 25.
The Independent Office for Police Conduct (IOPC) said a retired constable in his 60s and a former PC aged in his 50s were first arrested last year for alleged sexual offences during the 1990s.
Devon and Cornwall Police said it would be referring itself to the Independent Office for Police Conduct (IOPC) because Claire Butler had been known to officers prior to her death.
Devon and Cornwall Police said it would be referring itself to the Independent Office for Police Conduct (IOPC) because Claire Butler had been known to officers prior to her death.