There are more than 120 chapters listed under fraud in title 18 of the US Code. Without the exact type and code section, we can't tell you the statute of limitations. "Wire fraud" is a type of mail fraud.
CHAPTER 63 - MAIL FRAUD
Sec. 1343. Fraud by wire, radio, or television
-STATUTE-
Whoever, having devised or intending to devise any scheme or artifice to defraud, or for obtaining money or property by means of false or fraudulent pretenses, representations, or promises, transmits or causes to be transmitted by means of wire, radio, or television communication in interstate or foreign commerce, any writings, signs, signals, pictures, or sounds for the purpose of executing such scheme or artifice, shall be fined under this title or imprisoned not more than five years, or both. If the violation affects a financial institution, such person shall be fined not more than $1,000,000 or imprisoned not more than 30 years, or both.
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This is not legal advice and you are not my client. Double check everything with your own attorney and your state's laws.