Tali'Zorah, a quarian machinist, was born in 2161 on the liveship Rayya. During her Pilgrimage--a rite of passage in which quarians prove their worth to the fleet--she recovered a geth memory core that proved a rogue Spectre, Saren Arterius, was working with the geth. As a consequence, Tali'Zorah became a crew member of the SSV Normandy, where she served under Commander Shepard during the Battle of the Citadel.
Tali'Zorah returned to the Migrant Fleet following the destruction of the first Normandy. Soon after, the Admiralty Board sent her to the former quarian colony of Haestrom to recover data on the planet's dying sun. Most of her team was killed when they fell under attack from the geth, but Tali'Zorah herself was narrowly rescued by Shepard and the crew of the rebuilt Normandy. The quarian rejoined Shepard to help oppose the Collector threat, but her current whereabouts are unknown.