He was intrenched with Cerberus for a while, even had Bailey kill the Turian c-sec exec Pallin
Except that Pallin then found out that Udina was working for Cerberus and helped the Salarian Councilor escape after he was killed. Oops.
Oh wait, wasn't that only the second time that Pallin was killed in the series? Someone listed it out, and he's been killed like three times already.
1.)By the Geth in the Battle of the Citadel
2.)By Bailey
3.)By Kai Leng in the Cerberus attack