Jastine Valdez was murdered, probably by strangulation, on Saturday evening shortly after being abducted from a Co Wicklow roadside, gardaí believe.

Witnesses have reported seeing the Nissan Qashqai she was bundled into being driven “like a rally car” around the area where her remains were found in Rathmichael, south Co Dublin, yesterday, within 40 minutes of her abduction.

A note was found in the car, possibly connected to the planned suicide of her killer.

Ms Valdez, a 24-year-old student from the Philippines, had come to Ireland three years ago. Her parents have also been living here.

Garda sources said the DNA profile of her killer, Mark Hennessy (40), will now be crosschecked on the DNA database for any links to unsolved historical or recent sex crimes.

A review is also set to behighly unlikely to be a first-time violent offence.

Given the witness accounts of his driving, they believe he may have panicked and killed his victim more quickly than planned before dumping her remains to conceal his crimes.

There is no known link between Ms Valdez and Hennessy. Ms Valdez lived in Enniskerry, studied accountancy in Tallaght IT and worked part-time in a Bray restaurant. It was unclear if Hennessy frequented that restaurant.

The postmortem on the remains of Hennessy, who was shot by an armed garda on Sunday evening, was expected to show whether he was under the influence of intoxicants.

Ms Valdez was seen being assaulted and forced into a Nissan Qashqai on the R760 near Enniskerry just after 6pm on Saturday.

Gardaí believe that the car, owned by Hennessy’s wife Nicola,