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NEPHI, Utah -- Roger Boisjoly, a NASA contractor who repeatedly voiced concerns about the space shuttle Challenger before it exploded, has died. He was 73.
Boisjoly died of cancer on Jan. 6 in Nephi, about 40 miles south of Provo, his wife Roberta Boisjoly said.
The 1986 Challenger tragedy shocked the nation. Seven astronauts, including a schoolteacher, were killed when the shuttle disintegrated 73 seconds after liftoff from Cape Canaveral, Fla.
Boisjoly, an engineer at rocket-builder Morton Thiokol Inc., warned in 1985 that seals on the booster rocket joints could fail in freezing te