Police released surveillance photos of the suspect, who entered the Kings Highway Cutoff gym in the evening.
Police said four lockers were entered. The suspect also made off with a few wallets containing IDs and credit cards and some house and car keys, police said.
Anyone with information regarding the thefts or the suspect is asked to call the Fairfield Police Detective Bureau at 203-254-4840 or Text-a-Tip to CRIMES (274637).
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