http://www.planetslade.com/murder.html
Did somebody mention Murder Songs?
Can you murder a zombie? 
Seriously, though, thanks for the link.
Almost anything by Cannibal Corpse. Or most other death metal bands.
Delia’s Gone, by Johnny Cash, which has just about my favorite lyric ever:
A few more:
“Jeremy” Pearl Jam
“Billy Bardo” Johnny Paycheck
“I’ve Just Gotta get a Message to You” BeeGees
“Rocky Racoon” Paul McCartney
Yeah, it’s a zombie…and my fave murder song “Delilah” has already been mentioned…but I gotta add one here:
The Smith’s This Night Has Opened My Eyes:
From the sixties a song by Noel Harrison - A Young Girl
She should of known the day would come
When he would quit her just for crumbs
He needed fresh young meat to carve
And left her heart and mind to starve
A young girl
A young girl of 16
Child of springtime still green
Lying here by the road … dead
How about Jim Croce?
I think of the killing in Bad, Bad Leroy Brown as more of a bar fight, not so much of a murder.
Elvis Costello’s Watching the Detectives:
“Though it nearly took a miracle to get you to stay
It only took my little fingers to blow you away”
John Wayne Gacy, Jr. - Sufjan Stevens
*Jigsaw Girl *by The Toadies
I Hold Your Hand in Mine-- Tom Lehrer
“You Don’t Mess Around With Jim”- Jim Croce
“Dark Lady”- Cher
Does cannibalism in a dire situation count? If so, Timothy by the Bouys works.
Atlantic City, also by Springsteen, popped to mind as a murder about to happen:
"Now, I been lookin for a job, but it’s hard to find
Down here it’s just winners and losers and don’t
Get caught on the wrong side of that line
Well, Im tired of comin out on the losin end
So, honey, last night I met this guy and Im gonna
Do a little favor for him
Well, I guess everything dies, baby, that’s a fact…"
Am I the only person on Earth to wonder perversely about Bobby Goldsboro’s “Honey (I Miss You)”…?