Here's a clue: At least one hero is murdered in order to generate interest in another comic.
Still too many to choose from?
How about, it's a currently running storyline?
Wait, that's good for at least three comics.
Written by Judd Winick?
That narrows it down to two...
Okay, the answer is Titans East. A one shot that gathers together a group of c-list heroes and Power Boy*, and then kills them.
I could go on about how short sighted it is to keep blowing holes in the diminishing roster of unique characters that make up the DC universe. I could talk about how every minor hero has a few fans who will be upset at not just their deaths, but the careless way they were cast aside.
It baffles me what they hope to achieve here. If you liked the characters, it's just going to piss you off. If you weren't particularly interested in them, you're not going to care much that they are dead. As for bigging up the mystery villain by demonstrating that they are not only capable of killing heroes, but evil enough to do so for no apparent reason; fans of that weary old trope are already well catered for right now, as there are two other DC titles running the same plot, and at least one of them is taking out much more powerful heroes.
My only faint hope in all of this is that DC will eventually apply the same strategy to their own offices. If they expect to generate interest by killing off a few has-beens and c-listers, imagine the publicity it would generate if Judd Winnick was graphically murdered by a mysterious editor in chief.
Get some new ideas, DC. This is not only stupid, annoying, and wasteful. It's also starting to get embarrassing.
*Power Boy does not qualify as a hero unless your definition of hero is wide enough to encompass creepy stalkers and attempted rapists.