If you are writing a comment for publication, please mark clearly 'for publication'.For all other inquiries please call the main Guardian switchboard on 020 7278 2332. The last-remaining footage of Steve Irwins final moments has emerged - with the Crocodile Hunter giving a poignant OK sign hours before an eight foot-wide stingray killed him. To contact the MediaGuardian newsdesk email or phone 020 7239 9857.He described his 'mission' on earth as being to 'save wildlife'. Irwin pulls the barb out and he begins to lose consciousness. Steve Irwin, who would have turned 57 on Friday, was probably best-known for his Crocodile Hunter series. The footage shows Irwin swimming above a stingray before it flicks up its tail and plants a barb into his chest. The tapes have been held in a safe in the office of the Queensland police commissioner amid fears the footage could fetch up to $A1m on the black market and be posted on an internet pay-per-view site. Internationally renowned environmentalist and television host Steve Irwin died Monday after his heart was pierced by the serrated, poisonous spine of a stingray as he swam with the creature while. The coroner's investigation into the death is almost completed and Mr Barnes will make a decision about an inquest after receiving the final police investigation. Normally a copy would be held in government files but state coroner Michael Barnes told the Australian that copies showing a stingray goring Irwin had been destroyed and the original returned to his widow before Christmas.