Steven Solari went to check on the man at the request of the man's mother in 2009 but ended up arresting him following a scuffle. Evidence presented during the trial showed Solari used pepper spray and the man sustained a head injury.
Prosecutors say Solari took the man to police headquarters for booking instead of to a hospital. Testimony indicated Solari punched the handcuffed man because he would not pose for a mug shot.
Prosecutors say Solari tried to cover up what happened.
Solari faces up to 10 years in prison when he's sentenced in January.
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Officials say a New Jersey man has died from injuries he suffered in a chain-reaction crash inside one of the tubes of the Lincoln Tunnel. Port Authority of New York and New Jersey police spokesman Joe Pentangelo says the 49-year-old Summit resident was among three people hurt in the accident.