Senior Constable Forte died after his vehicle was peppered with 27 bullets when Ricky Maddison opened fire with an automatic weapon in the Lockyer Valley, west of Brisbane, on May 29, 2017.

Maddison, 40, was shot dead by police the following day after being asked to surrender more than 80 times during a 20-hour siege.

An inquest into the deaths of both men is due to begin in the Coroners Court sitting in Toowoomba before State Coroner Terry Ryan on Monday.

In the weeks prior to the 42-year-old policeman’s death, Maddison was wanted by Toowoomba police over domestic violence-related charges that had been discontinued two years earlier, a pre-inquest hearing was told last year.

He accused authorities of deliberately and unfairly targeting him and refused to go to a police station.

Maddison called police on the day of Sen Const Forte’s death, refusing to surrender.

Shortly after his vehicle was spotted in Toowoomba and a slow pursuit authorised.

Maddison led police off the highway and over a dirt embankment that was only accessible to 4WD vehicles – like the one driven by Sen Const Forte.

The pursuit continued until Maddison stopped and almost immediately began firing at police.

Sen Const Forte urgently reversed, but the vehicle ran up a bank and rolled, trapping him and his partner inside.

The police officer died from extensive gunshot and shrapnel wounds.

Maddison was shot the following day after officers asked him to surrender 85 times.

He fired at police, including at a helicopter, 21 times before being shot dead as he tried to flee an inner cordon.

The inquest is expected to consider the interaction between police and Maddison in the lead-up to the deaths, previous attempts to locate him and management of the pursuit.

It will also examine siege management strategies and the events leading to the decision to shoot Maddison.

The inquest is set down for 10 days.