The general location of his division, regiment, battalion or even his company or platoon may or may not be relevant. Most often not. He could well have been a hundred miles away; on detached duty or even furlough. There's an endless number of possibilities as to the exact location and circumstances of his death. I can locate this info but it would probably cost more than you're willing (or able) to pay - and probably more than it's worth, anyway. That depends, of course, on the value you place on it.
"PH" indicates he was awarded the Purple Heart (the Order of the Purple Heart - properly, The Military Order of the Purple Heart - is an organization of living holders of that decoration). It's anybody's guess as to whether the award was posthumous; here again, the only determine for certain is to access records. Period.