The statute of limitations, or time period for a criminal prosecution to commence, in your state varies with the amount of money take; the more that is stolen, the longer the time period. The maximum is four years, if several thousand dollars (or more) are taken. The discovery rule does not apply to criminal prosecutions, so from what you write, you either are almost out of time or may be out of time for your former partner to be prosecuted. You should not waste any time in speaking with the police.