Ian Andrew Troi
Lieutenant Ian Andrew Troi was a Human Starfleet officer and husband of Betazoid Ambassador Lwaxana Troi. Ian and Lwaxana married in 2328, and had two daughters, Kestra and Deanna. However, Kestra drowned shortly after Deanna was born and, at the request of his grieving wife, Ian never mentioned his first-born daughter again. Ian worshiped Lwaxana, despite her unique perspectives on Human men. ()

Ian acceded to most of the cultural expectations of his strong-willed wife, living on Betazed and arranging for his daughter, Deanna, to be genetically bonded to Wyatt Miller, the son of his friends, Steven and Victoria Miller, in accordance with Betazoid tradition. One aspect of Human culture that Ian Troi passed on to his daughter was a fondness for stories of the American "Ancient West". () He would also often sing her to sleep, particularly with the song "Down in the Valley". ()

Ian Troi died in 2343. His wife and surviving daughter were devastated by his sudden death. ()

Deanna remembered him fondly years later. When she became pregnant by an alien energy being, she named the resulting child after her father. ()

Years later, Lwaxana passed on to Deanna a box of Ian's that had been passed down to him. The box contained photographs of several ancestors of the Troi family. ()

In 2370, Deanna encountered an image of Ian from her mother's memory, while linked with Lwaxana's thoughts. ()


Appendices

Background information 
Ian Troi was seen in flashback in "Dark Page", and was played by actor Amick Byram. 

Deanna's personnel file in  originally listed his name as "Alex Troi", though this was corrected in the remastered version.

His rank is derived from his , which suggested he was in the operations division.

His article at StarTrek.com mistakenly uses an image of Ian Troi.

Apocrypha 
The novel The Art of the Impossible establishes that Troi died when a building he and Elias Vaughn were investigating collapsed on top of them due to Romulan sabotage. As a close friend of Troi, it was Vaughn who told Lwaxana and Deanna of Troi's death and brought his body to them on Betazed. Troi was a lieutenant commander on the USS Carthage, on which he served as science officer with future Captain Rachel Garrett.

His mirror universe  appeared in the short story "Empathy" contained in the anthology Shards and Shadows. He was the commander of the ship Deanna, whose crew included  and the mirror William T. Riker, in 2376.

External links 
 
 

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Humans
Starfleet personnel (24th century)
Starfleet operations personnel