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- This character is a member of the O'Brien family.
- For the mirror universe counterpart, see Kirayoshi O'Brien (mirror).
- For other uses, see O'Brien.
In 2372, Keiko was working on Bajor, and was away from her husband for a number of months. During this time, she came back to the station for a brief visit with her husband, and as a result became pregnant. She soon realized that she was pregnant, and Molly also found out that she would had a little brother on the way. Upon moving back to the station, Molly broke the news to her father that she had a little brother coming, and Keiko confirmed to Miles that she was pregnant. (DS9 episode: "Accession")
A short time later, Keiko, Kira Nerys, and Julian Bashir were traveling together on a runabout when the ship suffered an accident. Keiko was seriously injured in the accident, and Doctor Bashir was forced to transfer the baby to Kira in order to save both Keiko's life and that of her unborn child. Because Bashir was unable to transfer the baby back to Keiko, Kira had to carry the baby to term - a pregnancy complicated by the fact that she was a Bajoran carrying a human child. (DS9 episode: "Body Parts")
Kirayoshi would grow up in a number of locations - for the first two years of his life he was raised on a mix of Earth and Deep Space 9. When his mother obtained a position from the Interstellar Agricultural Aid Commission to be the project leader of agricultural planetary renewal for post-war Cardassia in 2376, he would move with his family there. In 2383, his father would obtain a position designing the new Deep Space 9, and the O'Briens would settle there in 2385. (DS9 novel: Unity, DS9 novel: Cardassia: The Lotus Flower, DS9 novel: The Never-Ending Sacrifice, Star Trek - Typhon Pact novel: Raise the Dawn, Star Trek - The Fall novel: Revelation and Dust)
By 2409, O'Brien had joined Starfleet and held the rank of lieutenant. He was assigned to Memory Alpha as a member of the Starfleet Corps of Engineers where he specialized in helping officers upgrade their equipment. He was later reassigned as chief engineer of the USS Enterprise-F. (ST video game: Star Trek Online)
|Memory Alpha personnel and residents|
|David A. Goodman • Geoffrey Mandel • Chi Namthot • Kirayoshi O'Brien • Mira Romaine • unnamed Memory Alpha personnel|
|USS Enterprise-F personnel|
|25th century (from 2409)||Jirelle Kav • Kyona • Phillipa Matthias • Kirayoshi O'Brien • Savel • Va'Kel Shon • Tem Inasi • Samuel Winters|
|alternate timeline 2382-2388||Krueger • Geordi La Forge • Tom Paris • Jean-Luc Picard • William T. Riker • Deanna Troi|
|alternate timeline 2408||Blair • Data • Hauman • Lamont • Margolin • Tucker|