A Merrick hair salon manager stole more than a half-million dollars from his employer during a four-year period, Nassau police said Wednesday.

William Wittrock, 34, of Quebec Drive in South Huntington, was arrested Wednesday on a charge of second-degree grand larceny and is expected to be arraigned Thursday.

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As the manager and clerk of Salon Tom on Merrick Road, Wittrock issued checks payable to cash, police said, and bank records showed he cashed or deposited more than $500,000 of those checks into his personal bank accounts between August 2012 and August 2016.

Wittrock was arrested at his home, police said.