Oh the drama of Zack, will it never end?....here's what Hart Hanson had to say on the matter:
Q: Well me being a loyal viewer: Is Eric Millegan going to be back for season 5???!!!!
Hart Hanson: Millegan on Bones again?Hope so.But he plans to move back to NYC plus has another Big Opportunity raising a hand to Knock.
on DVD today at 
as well at