A series of freak events combined to kill Jennifer Susan Job-Massa as she ran on the Platte River Parkway on Wednesday.

The 34-year-old South Dakota pilot flew to Casper for the night, finding 60- to 80-degree weather.

It appears she was on the pathway when a thunderstorm hit north Casper bringing 60 mph winds.

Still under construction, sat a 1,000-pound shed built to protect scorekeepers at a ballfield from the weather.

As high winds moved in, she may have run to the shed to seek shelter, only to be crushed by the weight of the plywood when the structure collapsed, said City of Casper Risk Manager Reed Barr.

"The best way to describe this is as an act of God, so to speak," Barr said. "One in a million horrible accidents."

The National Weather Service in Riverton issued a severe thunderstorm warning for the Casper area at 5:06 p.m. and indicated there was a possibility for large hail and strong winds.

Dave Lipson, a meteorologist for the weather service, said a dust devil or whirlwind could have hit near the ballfields, causing the shed to topple.

A regional jet captain for SkyWest Airlines, Job-Massa, was scheduled to fly out of Casper on Thursday.

Rescue crews found Job-Massa wearing running clothes and shoes, which led Barr to guess she was walking or jogging when the accident happened.

The shed was only a temporary structure.

Phipps Construction owner Joe Phipps built the shed five weeks ago as a quick fix that "just got some shade on people's heads."

It was open, he said, with areas for the wind to blow through.

"There were really hard southwest winds hitting it for a month and nothing happened," Phipps said. "Usually, the wind blows right through it."

A baseball game was scheduled for 5:30 p.m. at the Field of Dreams. Around that time, a young player found Job-Massa's body under the shed.

Two parents did chest compressions on Job-Massa until paramedics arrived. She was declared her dead at the scene.

Job-Massa, a Sioux Falls, S.D. resident, worked for SkyWest for eight years and left behind her husband, Jim, said Marissa Snow, manager of corporate relations for the airline.

"SkyWest has lost a friend, colleague and family member, and we are truly saddened by her untimely death." Snow said. "Our hearts and prayers are with her family and friends during this difficult time."

Contact city reporter Christine Robinson at (307) 266-0639 or christine.robinson@trib.com