Driver Hits Family in Montana and Opens Fire, Killing 2

A man struck a family with his vehicle as they were walking beside a roadway near Glacier National Park in Montana on Sunday and then fired at them with a shotgun, killing a man and his 18-month-old daughter, the authorities said.

The man who was fatally shot was identified as David Siau, 39, of Syracuse, N.Y. The authorities said he and his family had been visiting the town of East Glacier Park, in Montana’s Rocky Mountains, when the attack occurred.

Two other members of the family, Christy Siau, 40, and Christina Siau, 30, of East Glacier Park, were critically injured in the attack, the authorities said. A GoFundMe page identified Christy Siau as Mr. Siau’s wife and Christina Siau as his sister.

The Glacier County Sheriff’s Office identified the gunman as Derick Amos Madden, 37, of Goldsby, Okla. The sheriff’s office did not give a motive for the attack, but said that Mr. Madden had previously been in a relationship with Christina Siau, and that he had unspecified “mental health issues.”

Just before 9 p.m. local time on Sunday, Mr. Madden “purposely drove his vehicle” into the family and, after crashing it into a tree, got out, armed with a shotgun, and “began shooting at the same victims he had just hit or attempted to hit with his vehicle,” the sheriff’s office said in a statement.

Mr. Madden fatally shot Mr. Siau and then continued shooting at the rest of the family as they were running away, according to the sheriff’s office. He injured Mr. Siau’s wife, Christy Siau, and killed their 18-month-old daughter, McKenzie Siau, who was being held by her mother, the authorities said.

Mr. Madden attacked Christina Siau with a knife, the sheriff’s office said. “During this attack Christina fought for her life and, despite receiving critical injuries,” the authorities added, “fatally wounded Madden,” who died at the scene.

Two other children were present, but were able to run away and were not injured, the sheriff’s office said.

The authorities said the two women and the 18-month-old were taken to a hospital in Browning, Mont., which is about 13 miles northeast of East Glacier Park. The child was pronounced dead at the hospital, and the two women were flown elsewhere to receive more intensive care for “critical injuries,” they said.

The attack was “isolated to this incident,” the sheriff’s office added, “with a clear nexus between the victims and Madden.” The investigation is ongoing, the sheriff’s office said.

The Siau family were active members of the baptist church community in upstate New York.

“We are mourning with the Siau and Brownell Families and will come alongside them during this time of unimaginable grief,” Justin Baratta, who works at the Missio Church in Syracuse, N.Y., said in an email. “It is certainly a broken world.”

Bethany Siau, the sister of David and Christina, set up a GoFundMe page to help with the family’s medical expenses.

“The number of people already reaching out and offering to help is incredible,” she wrote on the fund-raising site. “We appreciate you all.”