Can my employer require me to pay back money that was stolen via theft under my watch?

Question Details: I work at a bar that charges of cover fee for kids 18-20 on Tuesday evenings - 2 am. I was in charge of the money bag at the time but my attention was elsewhere when the theft occurred. Am I legally obligated to pay the employer back? I believe I am what's known as an "employee at will" because the only sheets I filled out when I was hired were my application and tax requirements. No other signatures pertaining to losses or anything else of the matter. The total value of the bag is $890.

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