Do you know this short story?

[Ezlivin]

When I was in college in the 70s, I read a short story in an anthology that began with a quotation from Blake's "Tyger". (The anthology had a golden cover, but I don't know if it was a Norton's anthology. I've checked their website.)

The story revolved around a black man who was an Army veteran. He kept a very neat room, was fastidious in how he did things (even chopping and stacking wood). He taught the (white) boys how to throw a football in a perfect spiral, among other things.

He has a girlfriend and something goes wrong and he ends up going nuts with his rifle (showing his military training as he shoots people).

At or near the end of the story the boys listen to the adults bragging after they kill the man. One of the boys says something along the lines of "We killed a b'ar!" to mock the adults.

The anthology also had Graham Greene's "The Destructors". (If that helps.)

Do any of you remember this short story? I'd love to re-read this work as an adult.

Thanks in advance.