HMS Illustrious at that time and witnesses have placed the two together on the night that Parkes disappeared. UK police have flown over to Gibraltar and have used sniffer dogs and have searched the sewers in attempts to discover Parkes' body. In 2005, the BBC broadcast two programmes (The search for Simon Parkes & October's edition of Crimewatch) which prompted Grimson to complain through his solicitor to Ofcom. Grimson complained that he had been unfairly treated in comparison to other suspects and that he had strenuously denied killing Parkes, but that was not mentioned in the programme. He also said that he had not been given enough notice by the BBC to respond to the claims in the two programmes and that police evidence used had no bearing on the case. Ofcom did not uphold either complaint. Police are also speculating that there are other unknown victims and believe that as Grimson killed people on the twelfth of December each year, that there could be a range between 11 and 20 unidentified victims at Grimson's hands. In 1998, Grimson was working at the Royal New Zealand Navy base of Devonport on an exchange programme of fire fighting training. Whilst he was there, a 29-year-old female Japanese immigrant, Kayo Matsuzawa, was found dead and hidden in a fire alarm cupboard in a stairwell of a building in Auckland. Grimson was considered as a suspect (although there are others) as he was friendly with the building manager. The building manager admitted that he had seen Grimson in the building on several occasions, and whilst Grimson was a suspect, investigators have noted that his other victims were men. Documentaries As well as Grimson's links to unsolved murders being the subject of the two BBC programmes in 2005 (The Search for Simon Parkes and the October 2005 edition of Crimewatch), his case was also featured in a 2019 documentary as part of Crime+ Investigation's series Murdertown. The programme was the opening episode of series 2 and was titled "Portsmouth". See also List of serial killers by country List of open prisons in the United Kingdom – Grimson is currently being held at one of England's 12 open prisons Colin Norris – UK gay serial killer convicted in 2008 David Smith – another British killer suspected of being responsible of other murders References Sources 1958 births 20th-century English criminals 21st-century English LGBT people British male