Nassau police said Wednesday they are looking for a man who stole a woman's wallet out of her purse at a hospital and used her credit and debit cards.

Police said the 30-year-old woman was working on the third floor of Nassau University Medical Center in East Meadow on April 1 when she noticed that someone had gone into an unlocked office and removed her black wallet from her purse. The wallet had cash as well as a credit and debit card in it, police said.

The woman later discovered that someone had used her credit and debit card to make unauthorized purchases on four separate occasions in early April, police said.

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A few hours after the wallet was stolen, at 11:45 p.m., the woman's credit card was used at an Exxon gas station at 196 Henry St. in Freeport, police said. About 20 minutes later, a cash withdrawal was made at the Bethpage Federal Credit Union branch's automated teller machine at 170 Fulton Ave. in Hempstead, police said.

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A little more than an hour after that, her debit card was used at the Walgreens at 89 Henry St. in Freeport, police said.

A week later, at 4:39 p.m., a cash withdrawal was made with the victim's card at the Bethpage Federal Credit Union at 210 West Merrick Road in Freeport.

Nassau detectives' investigation into the theft revealed the suspect who made the unauthorized transactions is a man with a heavy build. At one point he was seen wearing a red sweatshirt with a Champion brand logo on it, black pants, red sneakers and a black hat.

Anyone with information about this crime is asked to call Nassau County Crime Stoppers at 800-244-TIPS. All callers will remain anonymous.