CHICAGO (CBS) — A Chicago police officer convicted of beating a suspect inside a South Side convenience store four years ago was set to learn his fate on Wednesday.

Officer Aldo Brown was convicted of using excessive force after a jury trial last fall, but acquitted of filing false police reports about the incident.

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Brown was working as a plainclothes tactical officer in the South Shore neighborhood in September 2012, when he and his partner acted on a tip that drugs were being sold out of a convenience store in the 7600 block of South Coles Avenue, and employees were acting as lookouts for the dealers.

Surveillance video recorded Brown handcuffing employee Jecque Howard and several others, searching customers’ pockets, and walking up and down the aisles looking for contraband.

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At one point, Brown is seen punching Howard in the face, choking him, then punching him in the ribs, and dragging him through the store. Investigators said the beating went on for about a minute.

Sentencing was scheduled for 11 a.m. Wednesday, and he faces a maximum sentence of 10 years in prison, although prosecutors have asked for only 2 ½ years, and defense attorneys have sought only probation.

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Brown has been suspended without pay, and faces mandatory firing because of his felony conviction.