University graduate Michelle Leng was stripped naked, bound and gagged before her uncle allegedly stabbed her and dumped her body in a blowhole on the NSW Central Coast. The horrific details of Ms Leng's final hours have been revealed after detectives laid further charges against her uncle Derek Barrett on Wednesday. Ms Leng's body was found floating face-down in the Snapper Point blowhole in the Lake Munmorah national park on Sunday, April 24. At the end of April, homicide detectives charged Mr Barrett, 27, who lived with Ms Leng, 25, in Campsie, with murder. The former IT worker was charged with 27 additional offences, including detaining for advantage, committing an act of indecency and filming private parts without consent when his case was mentioned in Burwood Local Court on Wednesday Some of the charges relate to a child of whom Mr Barrett is accused of taking photographs while she was sleeping. He is also accused of filming himself masturbating over the child and Ms Leng in several separate incidents before Ms Leng's death. Police will allege they came across the material alongside photographs showing a naked Ms Leng, bound with duct tape around her wrists and across her mouth. It will be alleged those photos were found on a mobile phone linked to Mr Barrett. Ms Leng was stabbed more than 30 times and suffered a number of defensive wounds. She was last seen in public on CCTV footage at Campsie train station on Thursday, April 21. She had spent the afternoon shopping in Pitt Street. It appears her cousin came home on Friday, April 22, unaware that Ms Leng was being kept captive and bound upstairs. Police tracked Mr Barrett's movements to the Central Coast, as he visited relatives in the area, before Ms Leng's body was found. CCTV captured a car driving into the national park at 7am on Sunday, April 24. Ms Leng's body was found at 10.30am that day. Ms Leng's aunt, who is married to Mr Barrett and who also lives at the Campsie home, was in Wollongong when Ms Leng was allegedly murdered. Ms Leng, who was also known by her Chinese name Mengmei, moved to Australia from China to study at the University of Technology, Sydney, five years ago. Mr Barrett did not appear in court and the case was adjourned to August 10. Clarification: An earlier version of this story described the second alleged victim as a child.

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