Simon Parkes, from Bristol, was last seen in December 1986 when the Royal Navy ship he was serving on, HMS Illustrious, was docked in Gibraltar. Nicholas Wright, who was a sailor in the Royal Navy (Image: PA)READ MORE: Former Royal Navy instructor Allan Grimson guilty of rapeGrimson, who on Monday was found guilty of sexually assaulting four males, has always denied being involved in the disappearance. READ MORE: Criminal past of Hollesley murderer and rapist revealedMrs Parkes said: “I was very disappointed that the investigation was dropped. Grimson had also been serving on the aircraft carrier when it docked at Gibraltar. Grimson, now of Grove Road, Hollesley, will be sentenced by the court on November 6.