For three decades, retired NASA engineer Bob Ebeling blamed himself for being unable to stop the 1986 launch of space shuttle Challenger. He had warned that the shuttle might explode, and it did shortly after liftoff, killing seven crew members.

In the final weeks of his life, however, thanks to an outpouring of support following a National Public Radio story in January on the 30th anniversary of the disaster, Ebeling, 89, finally found peace.

"It was as if he got permission from the world," Ebeling's daughter, Leslie Ebeling Serna, told NPR on Monday. "He was able to let that part of his life go."

Ebeling died Monday in his home in Brigham City, Utah, after a prolonged illness with prostate cancer, NPR reported.

Challenger Engineer Who Warned Of Shuttle Disaster Dies https://t.co/ww6ibIcfYz — NPR (@NPR) March 22, 2016

Ebeling was one of five engineers at a NASA contractor then called Morton Thiokol who warned the space agency that cold temperatures predicted at the time of the launch could prove disastrous. The warning was ignored.

The night before the launch, Ebeling reportedly told his wife, Darlene, "It's going to blow up." He told another daughter, Kathy Ebeling, that he had toyed with the idea of bringing his hunting rifle to work to threaten NASA not to launch, according to an article last month in The Washington Post.

The next day, Ebeling watched in horror as the shuttle disintegrated over the Atlantic Ocean, 73 seconds after liftoff. He quit his job soon after that. And for the rest of his life, he carried guilt for not having done more.

"I think that was one of the mistakes that God made," Ebeling told NPR in January. "He shouldn't have picked me for the job. But next time I talk to him, I'm gonna ask him, 'Why me? You picked a loser.'"

North Carolina resident Jim Sides was one of the hundreds of people who reached out after hearing Ebeling's story.

"God didn't pick a loser," Sides told NPR. "He picked Bob Ebeling."

With support from people around the country, Ebeling finally put his feelings of failure aside, his family members said.

"Thank you," Ebeling told NPR last month, when asked if he had anything to say to those who wrote him letters. "You helped bring my worrisome mind to ease. You have to have an end to everything."

Ebeling also was a bird enthusiast. After leaving his engineering job, he devoted himself to restoring Utah's massive Bear River Migratory Bird Refuge, The Salt Lake Tribune reported Monday.