The families of the killer’s victims have been notified, 9News understands.
Denyer was sentenced to life in prison without parole but the term was later reduced to a non-parole period of 30 years on appeal.
Denyer murdered Natalie Russell, Elizabeth Stevens and mother Deborah Fream in the Frankston area.
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Stevens, 18, was murdered by Denyer after she got off a bus on her way home from the library on June 11.
On July 8, Seaford mother Fream, 22, was killed when she was ambushed by Denyer in her car.
A fortnight later, Natalie, 17, was murdered as she walked home from school.
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