Tier was an officer of the rank of lieutenant within the ranks of the Imperial Navy. He was stationed on the Imperial-class Star Destroyer known as the Vengeance during the era of the Galactic Civil War. In the time frame of Nine months after the Battle of Yavin, Tier, together with Lieutenant Wolver, joined Captain Thrawn on a journey to S'krrr. The purpose of this trip was to analyze the artistic creations of the S'krrr species. Following the discovery of Wolver's lifeless body within the Sikadian Gardens, Tier aided Thrawn in initiating an inquiry into the circumstances surrounding the demise. The suspected origin of the fatal injuries was a vibropike. Upon locating such a weapon concealed within the vegetation, Tier went with Thrawn to apprehend Sh'shak, a poet and warrior of the S'krrr species who was believed to be the owner. While Sh'shak was in the process of attempting to convince Thrawn of his lack of culpability, the captain gave Tier the assignment to locate Vroon, who was the caretaker of the garden. During his journey towards the caretaker's place of work, Tier found himself under assault by a multitude of drog beetles. The lieutenant made a hasty retreat back to Thrawn's location, but his efforts were in vain. The insects infiltrated his mouth, leading to his suffocation and subsequent death, despite Thrawn's attempts to provide assistance. Tier's unfortunate end demonstrated Sh'shak's innocence and revealed that the drog beetles were the true culprits responsible for the deaths of both Imperials.