Crane, a Clone Commander, was seen in a Force vision by Dooku. In this vision, which took place during the Clone Wars, Crane was under the command of Jedi Master Jor Aerith. Dooku's vision showed Crane carrying out Order 66 by shooting Master Aerith during a battle.
Cavan Scott wrote the audiobook Dooku: Jedi Lost, which was the first appearance of Crane. It was released in 2019.