The gun used to fatally shoot a woman on the San Francisco Embarcadero belonged to a federal agent, sources confirmed Tuesday.

Kathryn Steinle, 32, was shot once in the back Wednesday while strolling on the tourist-friendly waterfront with her father. She died at a hospital a short time later.

Juan Francisco Lopez-Sanchez, 52, pleaded not guilty earlier Tuesday to a  murder charge and was being held on $5 million bail. In an interview with KGO-TV, which first reported the gun’s connection to the federal agent, Lopez-Sanchez said he had found the weapon wrapped in a T-shirt on the ground near a bench, and that it had accidentally fired when he touched it.

But he also said he had taken strong sleeping pills and his memory was murky.

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