Ianto Jones (19 August 1983-2009) was a junior researcher at Torchwood One who later joined Torchwood Three. He first approached Captain Jack Harkness with enthusiasm about joining Torchwood Three in Cardiff, eventually winning him over. He initially served as more of a "support man" or "tea boy", but later took a more active role in missions, though his attempts to shroud his past impacted the team. He later fell in love with Jack and became his romantic partner. He was murdered by the 456 ambassador when it spread a deadly virus through Thames House. The after-effects of Ianto's death left Jack riddled with guilt and grief, ultimately spelling the end of Torchwood Three.