'CSI' Star George Eads: Custody Battle Brewing In Divorce

'CSI' star George Eads will face off with his soon-to-be ex-wife over the custody of their one-year-old daughter in an ugly divorce.

Eads filed divorce docs against Monika Casey ... the two have been married for 4 years. Eads wanted joint physical and legal custody of their daughter Dylan. However, Monika is asking for sole physical custody of the kid.

The two disagree on more than just custody of their daughter. Eads claims the two had a prenup but Monika doesn't mention it. In fact ... she's asking for spousal support.

They cite irreconcilable differences as the reason for the divorce ... the two appeared on an episode of "Flipping Out," but no word if a rough home remodel led to the split.