(born April 14, 1972) is an Australian serial killer, currently serving 3 consecutive sentences of life imprisonment with a non-parole period 30 years at HM Prison Barwon for the murders of Elizabeth Stevens, 18, Debbie Fream, 22, and Natalie Russell, 17, in Frankston, Victoria in 1993.

Denyer is known as the "Frankston Serial Killer" due to his crimes occurring within the Frankston, Victoria area. The Frankston Serial Killer was featured in the pilot episode of the Seven Network show Forensic Investigators.

During a seven week period in 1993, Denyer stalked and murdered three women in the Melbourne suburb of Frankston. Denyer was 21 at the time of his crimes. During a police interview, Denyer's motivation for his crimes became apparent when he replied to police questions stating he hated women in general:

POLICE: Can you explain why we have women victims?
DENYER: I just hate them.
POLICE: I beg your pardon.
DENYER: I hate them.
POLICE: Those particular girls or women in general?
DENYER: General.

The first victim was 18 year old Elizabeth Stevens. She had just gotten off a bus to Langwarrin, when she was dragged to nearby Lloyd Park. Her throat was slashed and a criss-cross pattern was carved into her chest.

A month later, the second victim, Deborah Fream, was abducted after leaving her car unlocked to run into the milk bar to buy some milk. She was taken to Taylor's Road, and just like Elizabeth, her throat was slashed savagely. She left her 12 day old baby at home while she went to buy the milk.

The third and final victim, Natalie Russell, was walking home early from school down a bike track which was a short cut from her home. The 17 year old was dragged through a large hole in a wire fence, and she put up a huge fight; this made Denyer angry, and he slashed at the teenager's head and neck. Her death was the most brutal.

Rosza Toth was walking home from Seaford railway station when she was dragged towards the toilet block; she managed to break free of Denyer's grasp and notified police.

Connections with the 1990 disappearance of Sarah McDiarmid were indisputable; but as her body was never found, only a pool of blood next to her car, parked at a railway station, led police to believe there was a connection.

Similar connections to the murder of Michelle Brown have also been discussed, but as she was found naked, and her body was too decomposed to examine the injuries, this is unlikely.

Whilst imprisoned, Denyer requested to be allowed to purchase and wear women's cosmetics, which was denied.

Denyer also filed freedom of information requests to learn of the Victorian government's policy on gender reassignment surgery for prisoners and has sought evaluation to determine his suitability for such surgery, which was also rejected by medical specialists
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