Who was Derick Madden? Gunman stabbed to death by ex-GF after he kills her brother and 18-month-old niece

When Madden ran out of ammunition, he drew a knife and began stabbing his ex, Christina Siau, who managed to kill him on the scene


                            Who was Derick Madden? Gunman stabbed to death by ex-GF after he kills her brother and 18-month-old niece
Derick Madden (R) shot and killed David Siau, 39, and his 18-month-old daughter McKenzie in the small town of East Glacier Park (Facebook/@David Siau, @Derick Madden)
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BILLINGS, MONTANA: A man who drove his truck into a family of five vacationing in Montana, then opened fire on them with a shotgun, had raised “red flags” regarding his mental health in the years prior, according to his sister, and was only stopped when the apparent target of his rage managed to fight back and kill him with his own knife. After hopping out of his truck, Derick Amos Madden, 37, fatally gunned down 39-year-old David Siau and his 18-month-old daughter McKenzie, who was visiting from Pompey, New York, authorities said. Siau’s wife, Christy, was critically wounded but survived the roadside ambush on Sunday. 

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The couple’s two other children were able to flee to safety, miraculously escaping injury. Madden’s apparent target had been his ex-girlfriend, 30-year-old Christina Siau. Christina, David’s sister, lived in East Glacier and worked as a physician assistant at a hospital serving the Native American community. When Madden ran out of ammunition, he drew a knife and began stabbing Christina, according to cops. At some point during the gruesome rampage, Christina, badly wounded, managed to kill Madden on the scene.

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Although police have not yet revealed how Madden died, his sister said on Wednesday that investigators informed her that Christina at one point managed to wrest the knife away from Madden, stabbing him to death. Christina Siau was originally from New York and had been living in East Glacier, where her family was visiting, Jody Hickey, a spokesperson for Glacier County Sheriff Vernon 'Napi' Billedeaux, said. 

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McKenzie Siau was later pronounced dead at the Indian Health Service hospital in Browning. Christy and Christina Siau were flown to a hospital with critical injuries. Authorities were still trying to determine if Madden, originally of Goldsby, Oklahoma, had the shotgun legally. The sheriff's office described it as an "isolated...incident with a clear nexus between the victims and Madden" and said the investigation was continuing. It was not clear what provoked Sunday's attack beyond the prior relationship between Madden and Christina Siau. Local authorities did not know of any previous interactions that Madden had with law enforcement. 

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Christy Siau was a former book keeper for the American Baptist Churches of New York State, according to a social media postings by the organization. She was described as 'a long time and beloved member' of the organization's staff in a statement from Executive Minister Rev. James Kelsey. Michaela Siau Pfohl, David and Christina Siau’s sister, asked the public for privacy as the family grieves while speaking to The Daily Beast by phone on Wednesday, July 20. A fundraiser has been set up to help the surviving members of the Siau family with expenses. “You can definitely share the GoFundMe because while money isn’t going to fix all the problems, it will help my sister and sister-in-law as we try to step forward from this,” Pfohl said. 

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Christina Siau (GoFundMe)
Christina Siau (GoFundMe)