The cover is a fakeout: Flash is not killed in this issue.
Peter Parker interviews Flash Thompson, who is in jail after being “unmasked” as the Hobgoblin, and while he’s with Flash in jail, he changes into Spider-Man to stop Scourge from assassinating Flash.
Then, later in the issue, Scourge kills Wraith. Who’s Wraith, you ask? It doesn’t matter. Justice was served.
Chronologically, I believe this was the first Scourge killing.
And a little more Hobgoblin/Rose too.
Peter David wrote this issue of Amazing Spider-Man, with Mary Jo Duffy (and Tom DeFalco getting plot credit). He was writing all three titles at this time!