In this file photo dated December 23, 2014 a photo show Katrina Dawson (L) and Tori Johnson (R) at a memorial site outside the Lindt cafe in Sydney.

An inquest into the deadly Sydney cafe siege heard Thursday that one of the two hostages who died in December was killed by fragments from a police bullet or bullets.

Katrina Dawson, a 38-year-old barrister and mother-of-three, was killed along with cafe manager Tori Johnson, 34, when police stormed the cafe in Sydney’s financial district in the early hours of Dec.16.

“Ms Dawson was struck by six fragments of a police bullet or bullets which ricocheted from hard surfaces into her body,” counsel assisting the coroner’s inquest, Jeremy Gormly, said.

“I will not detail the damage done to Ms Dawson other than to say that one fragment struck a major blood vessel. She lost consciousness quickly and died shortly afterwards.”

The inquest at the NSW Coroners’ Court is seeking to outline what happened in the siege.

A separate joint investigation commissioned by the federal and New South Wales governments is set to submit a report into the siege in the next few days.

The other hostage, Johnson, was killed by a bullet to the head from Iranian-born gunman Man Haron Monis, 50. Monis was also killed during the police raid.

Gormly told the hearing Johnson was killed with a sawn-off shotgun after being made to kneel on the floor just moments after several hostages fled the cafe.

“Johnson was made by Mr Monis to kneel on the floor of the cafe. After a short lapse of time, Mr Monis simply shot him without further notice or warning in the back of the head,” Gormly said.

“The end of the barrel was about 75 centimeters from Mr Johnson’s head at the moment of discharge. Mr Johnson is believed to have died immediately.”

Gormly said the shooting was witnessed by a police marksman, which then led to the order for trained police “tactical operatives” to force their way into the cafe.

Some 22 shots were fired by the officers at Monis after 11 flash bangs were thrown into the cafe, while Monis fired two shots, the hearing was told.

“Bullets and fragments of bullets hit Mr Monis, who was it seems killed instantly,” Gormly said.

“At least two bullets, police bullets or bullet fragments, hit Mr Monis in the head and 11 other bullets, police bullets or fragments, hit him in the body.”

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