Convicted rapist Francis John Wark, 65, killed 17-year-old teenager Hayley Dodd
She was last seen alive in 1999 walking along a road about 200km north of Perth
Hayley s mother Margaret fought for 22 years for Hayley s killer to face justice
Judge said Wark stopped at side of road and attacked Hayley in violent struggle
WA Supreme Court ruling replaced a murder verdict from judge-alone 2018 trial
Judge said Hayley s manslaughter was one of the worst recorded cases in WA