Curtis Stevens won an eight round unanimous decision over Derrick Findley in the semi-main event.
West Midlands Police said PC Findley was left unconscious in the road following a "scuffle".
Findley agreed to join Forest on a free transfer last month after leaving MLS side Real Salt Lake.
Fellow officers described PC Findley, who joined West Midlands Police in 2003, as a "selfless and humble man".
Findley watched from the stands as Forest beat Portsmouth on Saturday, and has already been training with his new team-mates.
Stevens took control in the fourth in which he staggered Findley with a hook to the chin and repeated body shots.
Chris Findley was off duty when he suffered serious head injuries outside Divine Bar, Darlington Street, at about 04:30 GMT on 28 January.
Professor Findley said he had been so impressed with Chris' work that he had asked him to speak at the National Tremor Foundation's annual meeting.
BBC: Tonia Wells has a hereditary hand tremor in both hands.
Ch Insp Paul Betts said PC Findley, who was single, had spent most of his time with the force working with the neighbourhood police team in Smethwick.
Leslie Findley, a professor of neurology and the medical director of the National Tremor Foundation where Tonia now works, said the design should help many of his members.
BBC: Tonia Wells has a hereditary hand tremor in both hands.
She said her husband was quite proud of her creations which are about 2ft (60cm) high, and her nine-year-old son Findley gave her "9.7 out of 10 when he got home from school".
At first Leslie Findley, a consultant neurologist in England who has treated marathon runners, footballers and tennis players with mono, said it was a "myth" that those involved in tennis are more vulnerable than other athletes.
The two middleweights spent the majority of the bout trading blows, although the furious pace they set began to take its toll on the fighters in the fifth round as Stevens and Findley engaged in clinches following exchanges.
Aluminum foil as glassware scrubber: To get baked-on food off a glass pan or an oven rack, use dishwashing liquid and a ball of foil in place of a steel-wool soap pad, says Mary Findley, president of the cleaning-products developer Mary Moppins.
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