A series of phone calls and CCTV recorded a mother and daughter begging for their lives before a gunman murdered them while searching for his estranged wife.
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Mark James Bombara killed Jennifer Petelczyc, 59, and her daughter, 18-year-old Gretl, at their Perth home on May 24, 2024.
An inquest into their deaths got under way on Monday.
Bombara, who was searching for his ex-wife Rowena, turned a gun on himself as police arrived at the property.
The 63-year-old went to the Petelczyc home about 4.14pm, counsel assisting the coroner Rachael Young said in her opening remarks.
A neighbour's CCTV captured a man's voice asking, "Do you know where I can find her?" before Bombara is seen driving away.
Several minutes later, Jennifer called Rowena, who was with her daughter Ariel moving into their new apartment, and said Bombara "seemed strange".
Jennifer and Rowena had been friends for years, and Jennifer had supported her friend after she and Bombara broke up a month before his murderous spree.
"While on the call, Jennifer said to Rowena words to the effect, 'oh shit, he's come back'," Ms Young told the WA Coroner's Court.
CCTV captured a female voice saying: "No please don't."
Ariel then heard Jennifer say: "Gret, go hide."
Gretl called triple zero and said: "There is a guy in my house with a gun."
Rowena heard Jennifer say, "I told you she's not here", Ms Young said.
Jennifer's next words in the seconds before she died were: "Mark, put down the gun."
Rowena then heard Bombara say: "Put the zip ties on."
A neighbour's CCTV recorded Jennifer saying, "Come on darling. No, please don't", followed by a woman screaming.
Ariel was on the phone to police at the time and reported it.
About the same time, Gretl used Facebook to message her sister, Liesl, who was out with her boyfriend, Ms Young said.
"Call the police", she wrote.
"My hands are tied"; "He has gun to Jennys" and "Help", she said.
Bombara's first gunshot was recorded at 4.31pm by one of the eight calls made to triple zero during the incident
Rowena heard the gunshot through the phone.
A woman was also heard screaming and saying: "Please no, please Mark no, please leave my mum."
Bombara then says: "Rowena, where are you? Come out now, I know you are here."
A second gunshot was heard 16 seconds later while police were on the way to the home.
Bombara fired his third and fourth gunshots about five minutes later.
Police arrived four minutes after that and heard another gunshot in the home.
"This was the fifth and final gunshot," Ms Young said.
CCTV recorded it at 4.41pm.
"It is believed to be the final gunshot of Mark Bombara, self-inflicted, causing his death," Ms Young said.
Police found Jennifer in the dining room with two gunshot wounds to her head.
Bombara was nearby with a single gunshot wound to the left side of his head.
A Glock handgun was found on the floor of the kitchen-dining area.
Gretl was found in a hallway.
Her hands were restrained with cable ties, and she had two gunshot wounds to her head.
She died from her injuries in hospital a few hours later.
The inquest will examine the police response to the triple-zero calls and family violence allegations involving Bombara.
It will also investigate whether he should have been licensed to hold the 13 firearms he owned.
Bombara's medical care after he had several strokes and started experiencing mental instability will also be investigated.
The inquest earlier heard the separation between Bombara and Rowena had been acrimonious and he was "fixated" on his estranged wife.
He had a 10cm cyst on his brain and after his strokes, his family observed he was angrier, moody and at times "unhinged", Mr Young said.
The inquest continues.
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