The female Terelian Jango Jumper has impressive acrobatics skills which came in handy as a thief in the Coruscant underworld. Cassie Cryar's main objective was to steal highly-sought after objects. By helping her partner Ione Marcy murder her boyfriend, the Trandoshan assassin Nack Movers, Cassie obtained one of the most valuable items in the galaxy -- a Jedi's lightsaber. Her desire to keep the lightsaber made her overconfident. She believed she could wield the same power as a Jedi.
A string of circumstances led to Cassie possessing Ahsoka Tano's lightsaber, though Cryar was not the original thief. Ahsoka chased Cassie across many Coruscant rooftops in an attempt to retrieve her weapon.
Ione Marcy was Cassie's partner in crime. Wide-eyed and innocent looking, Ione easily deceived the law enforcement authorities into thinking she knew nothing of Cassie's involvement.
The weapon of a Jedi Knight can fetch a pretty high price in the underworld market. Though Cassie recognized the weapon to be of value, she was not skilled in its use and had difficulty activating it.