Working for Starfleet Intelligence, Miles O'Brien, posing as a man called Connelly, infiltrated the Syndicate through Bilby. When the Syndicate started working for the Dominion, Raimus and his Vorta contact, Gelnon, instructed Bilby to obtain Klingon disruptors and to kill the anti-Federation Klingon ambassador to Farius. The Syndicate and the Dominion envisioned that it would appear Gowron ordered the ambassador killed to silence him and support within the Klingon Empire for its alliance with the Federation would wither. Gelnon also believed that the death of the ambassador could lead to the Klingons withdrawing from the war.
O'Brien eventually grew fond of Bilby and revealed he was working for Starfleet Intelligence and that the Klingons had been informed of his plan. Even so, knowing the Syndicate would kill his family if he did not carry out the mission, he did so while leaving a request for O'Brien to care for his cat, which was done. He himself was killed by the Klingons. (DS9: "Honor Among Thieves")
As Bilby had died on the mission, the Syndicate looked after Morica, forcing the Tigan family to sustain her with money from their pergium business. She was murdered by Norvo Tigan after she demanded more money. (DS9: "Prodigal Daughter")
Liam Bilby was played by Nick Tate.
Tate commented "I really jumped at the chance to do the episode. It was one of those roles that I just loved. I thought Bilby was a wonderful character and the script was very, very clever". ("Deep Space Pirate", Star Trek Monthly, issue 42)
Colm Meaney commented: "I thought Nick did a wonderful job as Bilby, and I enjoyed working with him a great deal. It's fun to do those shows where it's just two guys playing out interesting, well-written scenes". (The Official Star Trek: Deep Space Nine Magazine, issue 24, p 46)
Veteran actor Charles Hallahan (best known for his role as Norris in The Thing) was originally cast in the role, but sadly passed away soon after and Tate agreed to perform the role in Hallahan's memory. Ira Steven Behr and Allan Eastman thought that Hallahan resembled Meaney, and that the resemblance would have made the relationship between Bilby and O'Brien much more like that of a father and son. (Star Trek: Deep Space Nine Companion)