CHICAGO (AP) — Boxer Patrick Day died Wednesday, four days after sustaining head injuries in a fight with Charles Conwell.

Promoter Lou DiBella said Day died at Northwestern Memorial Hospital. He was 27.

Day had brain surgery after being knocked out in the 10th round Saturday night at Wintrust Arena. Knocked down twice earlier in the bout, the junior middleweight was taken from the ring on a stretcher.

From Freeport, New York, Day had a career record of 17-4-1 with six knockouts.