Eliza Marquette (Summer Bishil) was the villainess from "Flight of the Living Dead", episode 1.05 of iZombie (airdate April 14, 2015).
She was the marketing executive for Max Rager and the girlfriend of co-worker Carson McComb. She and Carson were also seemingly friends with several of their co-workers (Janko, Rita, Adele, Lowell Tracey, and Holly White), as they were all part of a skydiving group. But secretly, Eliza hated Holly for her past fling with Carson and was plotting to kill her.
Eliza did so by taking advantage of the shots she and her co-workers took before their skydiving endeavours, dosing Holly's glass with GHB. Eliza's poisoning resulted in Holly becoming impaled on a branch after jumping, killing her. While under interrogation, Eliza denied being bitter of Holly's fling with Carson and went along with her friends' belief that Lowell was behind Holly's death due to him jumping after Holly (this is later revealed to be because Lowell was a zombie and had been in the midst of transforming). At Holly's memorial, Eliza was snide about Liv's arriving and tried to ask her to leave, but was stopped when Liv revealed that she and Holly had been sorority sisters.
After it was revealed that Eliza was Holly's murderer, Clive stormed her house with other officers to arrest her, but found that she was gone. In a later episode, "Mr. Beserk", it was revealed that Eliza (like the other Max Rager employees) was informed about the violent (and often murderous) episodes their company's soft drink had on people, and had been helping her boss Vaughn Du Clark cover up the secret. But after Liz narrowly escaped being killed by Clark's henchman Sebastian Meyer after witnessing him send Adele (who had been working undercover to expose Max Rager's true nature) to a death by drowning, it was presumed that Eliza had been killed the same way due to being viewed as a liability.