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In page David M. Brown:

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As the lone unmarried member of the STS-107 crew, Brown had previously been romantically involved with NASA engineer Ann Micklos. The two ended their relationship shortly before the mission, but remained close friends until his death.[1] The crew of STS-107 had also formed a very close friendship in their training, that Brown had been preparing a videotape to commemorate once they returned from their mission. Brown is buried in Arlington National Cemetery.