Oklahoma Man Allegedly Ran Over Ex-Girlfriend’s Family In Montana Then Shot Them

An Oklahoma man allegedly ran down his ex-girlfriend's family members in his pickup truck while they were strolling through Montana's Glacier National Park earlier this month and then opened fire on them with a shotgun, authorities say. 

Derick Amos Madden, 37, allegedly targeted his ex, Christina Siau, 30, her brother, David Siau, 39, his wife Christy Siau, 40 and the Siaus' three kids, including their 18-month-old daughter, McKenzie, and her older siblings Bohdan and Kaylin. David, Christy and their children had been visiting his sister in Montana from their home near Syracuse, New York, where the siblings had grown up.

The Glacier County Sheriff Emergency Dispatch Center received multiple reports of a man shooting at a woman in the East Glacier National Park area just before 9:00 p.m. on July 17, a press release stated.

Madden had allegedly driven his Toyota Tacoma pickup truck onto a sidewalk in the park, aiming for the Siau family. After hitting a tree, police say that Madden exited his vehicle and began shooting, hitting David, Christy and McKenzie, who was being held by her mother as she ran.

Authorities say after Madden ran out of ammunition, he attacked Christina Siau with a knife. He died during the struggle at the scene.

"She fought back, and she won," Seifert Captain Tom Seifert told Fox News.

Christina and her sister-in-law Christy were both airlifted to the hospital with critical injuries. David and McKenzie both died as a result of their gunshot wounds. The couple's other two children were not injured, according to Syracuse.com.

According to the Glacier County Sheriff's Office, Madden had been in a prior relationship with Christina Siau and had mental health issues. 

The Glacier County Sheriff's Office referred to this killings as a "horrific event." 

The exact speed at which Madden was traveling when he struck the family is being ascertained by the Montana Highway Patrol, but Seifert said it was faster than the posted speed limit, which is 25 miles per hour.

It is also still unknown if Madden had the shotgun legally, according to the authorities.

John Siau, the father of David and grandfather of McKenzie, taped a video statement to thank the community for their support — and to what he told his family to keep morale high.

"Grieve, be sad, but don't harbor anger about what has happened," he said. "Because what we have seen is actually the result of somebody who has harbored anger in his own life and allowed it to fester and grow and develop into something terrible and unspeakable."

One of David's surviving sisters created a GoFundMe for the family, which had raised nearly $140,000 to help Christy and Christina with medical bills as of Monday morning. The Siaus' church also launched a fundraiser with the permission of the Siau family, which had raised more than $35,000 by the end of last week, according to Syracuse.com.