Tyler Thello was a Jedi Knight of the male persuasion, a Human who dedicated his life to the service of the Jedi Order and the Galactic Republic. He fought during the era known as the Cold War against the reconstituted Sith Empire. Not long before the outbreak of the Galactic War, Thello was tasked by Jedi Battlemaster Jun Seros with working alongside Agent Dhal from the Republic Strategic Information Service. Their mission was to apprehend the bounty hunter responsible for the deaths of both Jedi Master Kellian Jarro and his Padawan, Thendys Noori, as well as the destruction of the Republic warship, the Aurora. Dhal set a trap for the bounty hunter on the planet of Quesh, and Thello led a team to capture the hunter. However, the hunter proved too skilled, killing Thello and his entire team before escaping.
The character Tyler Thello makes an appearance as an opponent in the Bounty Hunter class mission titled "Endorsement" within the video game Star Wars: The Old Republic. Should players have spared Thendys Noori, she will be the one appearing in Thello's place. However, since the Bounty Hunter is an Imperial class and is generally expected to make dark side choices, the assumption is that Thello is the one present on Quesh.