“Desperado” by Alice Cooper (He has lots of death songs, it would seem).
"You’re as stiff as my smoking barrel
You’re as dead as a desert night
You’re a notch
And I’m a legend"
Actually, Axl Rose is talking about a pet dog he had euthanized. He thought it would be fun to write a song that made it sound like he was talking about a wife or girlfriend.
L.A. County by Lyle Lovett
“And they kissed each other
And they turned around
And they saw me standing in the aisle
Well I did not say much
I just stood there watching
As that .45 told them goodbye”
Yeah, those are the ones I was thinking of.
Tom Dooley:
Met on the mountain
There I took her life
Met her on the mountain
Stabbed her with my knife
Boot Hill:
Look up on the wall baby
Hand me down my shootin’ iron
Look up on the wall baby
Hand me down my shootin’ iron
Call your mother long distance
Tell her to expect your body home
A couple of others…
The End by the Doors:
Father, I’m going to kill you
Aisha, by Death in Vegas:
Aisha, we’ve only just met
And I think there’s something you ought to know
I’m a murderer
Friends, by The Police (maybe not murder, but cannibalism):
Your death of course, will sadden me
Until I grok your essence
I know your life was not in vain
When digestion is commencing
Consider this a celebration
And the deepest pact of friends
And I hope that you will dine on me
When I come to an end
Can’t think of the correct title right now, but I think it is “Good Day” by the Flaming Lips where they mention killing their boss when they get to work. I can’t google the lyrics from work because of a filter. Help anyone?
I was making a play on the term “death metal.” Unsuccessfully, I might add.
And Murcielago mentioned “Plush,” by STP. But I recall an interview I heard on the radio with Scott Weiland, who said that it was just about a blind date that wasn’t that great.
While the Talking Heads Take Me to The River ( an old cover ) is definitely about baptism, their Warning Sign always struck me as a serial killer rumination ( not to mention the much more obvious Psycho Killer ).
- Tamerlane
“Deep Deep Down” by the Mr. T Experience. The singer reflects on apparently losing his temper and killing his girlfriend.
“You are always were an angel in my eyes
And now more than ever the term applies”.
Joe Jackson did a whole album about Mike’s Murder.
OK, it doesn’t really count, because it’s a movie soundtrack … 
stpauler, you forgot John Wesley Harding’s The Devil in Me
And then there’s Roland the Headless Thompson Gunner by Warren Zevon.
but the story does not end there
Freedy Johnston’s “This Perfect World” was the first song that came to my mind:
"You oughta lock that door
Somebody might get in
Didn’t I teach you that?
…
"But I still deserve to say goodbye no matter what I’ve done
No matter what I’ve done
“I see her in your face
Hear her in your voice
Last time I was here they’d found her in the lake”
Oh, you mean like Barry Manilow’s “Mandy”? 
It’s hard to tell what person the song is in (as sung, it could conceivably be either first or third person), but Ugly Kid Joe’s Madman about a serial killer/child molester loose in Disneyland (IIRC The House of Mouse was none too happy about that particular song).
critter42
“Roland” by Interpol seems like it’s about a serial killer (“My best friend’s a butcher; he has sixteen knives”), and “Say Hello to the Angels” might be about killing someone or it might just be about sex (“Each night, I bury my love around you… Say hello to the angels”). It’s hard to tell; Paul Banks is sort of a weird lyricist.
Excitable Boy by Warren Zevon:
He took little Susie to the Junior Prom,
Excitable boy, they all said,
And he raped her and killed her then he took her home,
Excitable boy, they all said,
Well he’s just an excitable boy!
After ten long years they let him out of the home,
Excitable boy, they all said,
And he dug up her grave, and built a cage with her bones,
Excitable boy, they all said,
Well he’s just an excitable boy!
*
And of course Eminem has about a dozen songs where he talks about killing people. For example, the aptly named Kill You:
Put your hands down bitch, I ain’t gonna shoot you
I’ma pull YOU to this bullet, and put it through you
…
I said you don’t, wanna fck with Shady (cause why?)
Cause Shady, will fckin kill you (ah-haha)
I said you don’t, wanna fck with Shady (why?)
Cause Shady, will fckin kill you…
*
Then there’s Stan, Kim, 97 Bonnie and Clyde, and others.
Going back to some more classic songs, there’s The Man who Shot Liberty Valance and The Streets of Laredo
Oh, and another Zevon song: Jeannie Needs a Shooter:
*The night was cold and rainy
Down by the borderline
I was riding hard to meet her
When a shot rang out behind
As I lay there in the darkness
With a pistol by my side
Jeannie and her father
Rode off into the night
*
I can’t believe nobody’s mentioned Bohemian Rhapsody yet.
There’s also Chop Suey, where the singer contemplates killing himself:
Just A Job I Do, by Genesis. Song about a hit man, speaking to his next victim.
BTW, when I saw the title of this thread, the first thing that occurred to me was heavy metal poisoning.
Neil Young: “Down by the river, I shot my baby…”
And I have a really obscure single from 1973 by Australian Peter Foldy, titled “Bondi Junction”. It sounds like a run-of-the mill love ditty until the coda, where he turns the song around by singing “Yeah, that is where I shot her…(Bondi Junction)…hey, that is where I shot her…” Pretty strange! And it got on the radio in Canada.