Police Commissioner James O’Neill was among about 250 mourners Tuesday who paid their final respects to rookie Officer Brian Kessler.

Kessler, 28, who graduated from the Police Academy in October and was engaged to be married, was killed last week in a head-on collision with a garbage truck in The Bronx as he headed home from a night shift.

“I just talked to his parents. They’re absolutely devastated,” O’Neill said outside the Westchester Funeral Home in Eastchester.

Kessler family friend Arlene Thomas-Strand, 66, said, “His mother said that the thought of never seeing him again is just unbearable. And I agree with her.”

Funeral services will be held Wednesday at 10:30 a.m. at Immaculate Conception Church in Tuckahoe, Westchester.