The Independent Police Complaints Commission (IPCC) is investigating how Hampshire Police handled an allegation that murder victim Jamie Dack had been attacked two weeks before his body was discovered in a bin in Southampton.
Officers are being questioned on how they dealt with a report he was attacked on March 21.
The commission is also looking into the actions of officers after he was reported missing two days before he was found by fire crews in an industrial bin on Empress Road Industrial Estate on Sunday, April 8. The 22-year-old had suffered fatal stab wounds to his neck before his body was burnt.
The investigation was sparked by a voluntary referral by Hampshire Constabulary. Three men and a woman have been charged with his murder and have been remanded in custody.
IPCC Commissioner Mike Franklin said:
"My condolences go to Mr Dack’s family and friends at this terribly difficult time.
"I have determined an independent investigation should examine Hampshire Constabulary’s handling of the alleged assault on Mr Dack in March and also the information provided to them on Friday 6 April.
"It is my duty to ensure we apply our independent scrutiny to Hampshire Constabulary’s management of the assault allegation as well as how information they received regarding Mr Dack was progressed.”