CHICAGO (CBS) — An off-duty Cook County sheriff’s deputy fatally shot a would-be robber on Wednesday at a South Side beauty salon.

The incident happened around 1:40 p.m. Wednesday afternoon, at Marquita’s Hair Salon, in the 100 block of West 69th Street, in Chicago’s Englewood neighborhood on the South Side, according to Chicago Police.

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Police said two would-be robbers entered the salon and demanded property from those inside, one of whom was the off-duty deputy.

The Cook County Sheriff’s office said the deputy opened fire and fatally shot one of the suspects, according to police and the sheriff’s office.

A Chicago Fire Department spokesman confirmed the wound was fatal.

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The other robber escaped. It was not immediately known if he was also wounded.

No one else was hurt.

Chicago Police are conducting the follow-up investigation.

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This is a developing story. Check back for updates.