Authorities say man struck and killed by plane at Denver airport intended to take his own life

FORT COLLINS, Colo. (AP) — A 41-year-old man struck and killed by a plane in a fiery collision at Denver International Airport was intending to end his own life when he scaled a remote fence and walked onto a runway — a security breach that airport personnel initially missed, authorities said Tuesday.

No note from the victim was recovered and officials determined the cause of death to be suicide based on their postmortem examination, said Sterling McLaren, chief medical examiner for the city and county of Denver. She did not provide further details.

The collision involving the Frontier Airlines plane sparked an engine fire that forced passengers to evacuate. Twelve people sustained minor injuries and five were taken to hospitals. Four have since been released, said airport Chief Executive Officer Phillip Washington.

A black-and-white video released by the airport shows, from a distance, a tiny figure walking toward the runway with arms swaying. The person crosses onto the runway at a slight angle and seconds later the plane is seen speeding past. It strikes the person with its right engine, which bursts into flame upon impact.

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EDITOR’S NOTE — This story includes discussion of suicide. If you or someone you know needs help, the national suicide and crisis lifeline in the U.S. is available by calling or texting 988. There is also an online chat at 988lifeline.org

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Passengers were evacuated via slides.

A few minutes before the man scaled the fence, a ground-based radar system activated in the area, triggering an alarm. Security personnel using a surveillance camera saw a herd of deer in the same area but did not initially see the trespasser, Washington said.

He said federal officials notified the airport about the trespasser minutes later. But because of the location and short time period between the man scaling the fence and crossing the runway, he said airport personnel were not able to intervene.

The man crossed about 650 feet (200 meters) from the fence to the runway before being struck by the Frontier Airlines plane traveling at 150 mph (240 kilometers per hour) on takeoff.

The plane’s engine caused the man’s death, McLaren said.

Trespassers breaching airport perimeters is a longstanding and regular problem, with perhaps dozens annually nationwide, said security expert Jeff Price, who assistant director of security at the Denver airport in the 1990s. Denver International Airport is located northeast of the city center and surrounded by about 36 miles of perimeter fence, which airport officials say is continuously inspected.

The vast majority of airport trespassers are intoxicated or simply “messing around just to see if they could do it,” said Price, adding that they typically don't post a real threat. Denver also gets the rare individual who will jump the fence seeking to prove a long-running conspiracy theory about a UFO base being based at the airport, he said.

The Transportation Security Administration oversees airport security programs, including perimeter security requirements.

“It's really not that difficult to jump an airport perimeter fence,” Price said. “They meet the standards for TSA, but the standards are not that robust.”

The fences are typically 6 to 8 feet tall with barbed wire at the top, he said. They must be approved by federal inspectors, but there are no set rules on their construction. Major airports such as Denver also have intrusion detection systems that include cameras and motion sensors. he said. Some systems detect the seismic impact of people dropping to the ground, Price said.

The person was killed on the airport’s easternmost north-south runway and at least 1.25 miles (2 kilometers) from any airport buildings. Empty fields and croplands surround Denver International Airport in most directions. Distant trees and structures in the video showed that the person was headed toward the airport when they crossed the runway.

The Transportation Security Administration has regulatory oversight of airport security programs, including perimeter security requirements.

Separately, the National Transportation Safety Board on Sunday said it is gathering information about the evacuation.

An agency spokesperson said an investigation would be launched if it's determined the injuries meet the agency's definition for “serious." That can include a person requiring hospitalization for more than 48 hours, suffering a broken bone or second- or third-degree burns affecting more than 5% of their body.

Frontier representatives declined to answer questions about the accident and evacuation submitted by email. The company referred The Associated Press to airport authorities.