Walker spoiled the Hawks’ comeback from a deficit as large as 13 points, as Atlanta was led by Kent Bazemore’s 26 points on 9-for-16 shooting.
Bazemore had just three points in the first half, but knocked in 5-of-6 attempts in the third quarter to help fuel an offensive output that was two points shy of his career high.
Bazemore's free throws with 5:13 remaining gave the Hawks a 103-99 advantage that appeared to swing the momentum.
But Walker showed his first flash of what was to come with a 360-degree layup with 3:50 left that gave the Hornets a 105-104 edge.
After Ilyasova sank two free throws to give Atlanta a 107-105 advantage, Walker made his biggest basket -- and gave the Hawks their most recent heartbreak.