Help w/ Info. on 400th KIA named Hatley?

I'm looking for info. on my great-uncle, Corporal William G. "Gene" Hatley, who served in the 400th Bomb Squadron, 90th Bomber Group. He is listed as having been killed 4/8/1945, and I'm looking for any information regarding the name of his plane, crew names, flight records, etc. Next year will be the 50th anniversary of his death and I am looking on behalf of his sister, my grandmother. I know his ID number but that's about it right now.

Can anyone help steer me the right way? Thanks very much for any and all suggestions! Best--


Lauren