Zach was born in Montpelier, Ohio to Andrea and Daniel Roerig. Zach also has a younger sister named Emily who was born in 1989. Zach attended the Barbizon School of Modeling in Cleveland and went on to participate in the International Model and Talent Association where he signed with his late talent manager.

He graduated Montpelier High School where he was both a football player and a wrestler. While he was growing up, Zach worked for his father and grandfather at Fackler Monuments making gravestones.

Zach portrayed the role of Casey Hughes on As the World Turns from January 18, 2005 to May 2, 2007. Casey was the son of legacy couple Tom and Margo Hughes, and during Zach's time, Casey was part of a popular couple, the female half portrayed by Alexandra Chando. After his departure, Roerig accepted a role on the soap One Life to Live, as Hunter Atwood. He departed again later that year. He then made a few appearances on the popular show Friday Night Lights as Cash the cowboy. Most recently, he portrays Matt Donovan in The Vampire Diaries.

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