My question involves divorce in the State of: California

My divorce was finalized just over 5 years ago. I recently found out my ex never disclosed property purchased either before our divorce or during our divorce in another state and kept this hidden.

1.What is the California Statute of limitation to go back and claim 1/2 of this property? In the divorce decree is clearly states if there is any hidden/undisclosed property than the other party is due 1/2 of that.
2. Since my ex signed off stating he had no other property, and since I did not sign off on that property that would have been purchased while we were still legally married, would I be able to file criminal charges against them?