The Most Memorable Murders In Movie History (Warning: Spoiler Alert to End All Spoiler Alerts!)

  1. The shower scene. Done aaaaaand done.-Psycho
  2. Fredo breaks Michael's heart, pays the ultimate price-The Godfather II
  3. Daniel Plainview drinks Eli's milkshake; bludgeons him to death with a bowling pin-There Will Be Blood
  4. Tony Montana introduces Sosa's men to his little friend,; meets a few dozen of their own-Scarface (1983)
  5. The wood chipper....(Fargo)
  6. Bonnie and Clyde are gunned down by lawmen-Bonnie and Clyde'
  7. David Mills "becomes wrath"-Se7en
  8. Michael consolidates his power; takes out Moe Greene and the rival mafia dons amid the baptism of his niece- The Godfather
  9. "Freeeeedooommm!!!!"-Braveheart
  10. Hannibal Lector escapes his cell; borrows a face for the ride-Silence of the Lambs
  11. Holly Martins shoots his old mate Harry Lime; puts an end to a truly epic sewer chase-The Third Man
  12. A young Vito Corleone stalks Don Fanucci along the rooftops of Little Italy; surprises him in front of the Don's apartment with a towel-encased pistol-The Godfather II
  13. "And you will know my name is the LORD when I lay my vengeance upon thee"-Pulp Fiction
  14. Travis Bickle reaches his breaking point; murders Sport and his two bodyguards in the bloodbath of a finale-Taxi Driver
  15. Willard terminates Kurtz with extreme prejudice (ie a machete); gives him a true taste of "the horror..."-Apocalypse Now
  16. Butch Cassidy and the Sundance Kid finally reach the end of the line- Butch Cassidy and the Sundance Kid
  17. Tommy and Jimmy beat Billy Batts to death; load him into Henry's trunk for eventual disposal-Goodfellas
  18. "...Howard Beale, the first known instance of a man who was killed because he had lousy ratings"-Network
  19. "Luca Brasi sleeps with the fishes"-The Godfather
  20. Tony Dogs' doesn't talk, instead opts for his head to be slowly crushed in a vise. Uuugh...-Casino
  21. Bambi's mother gets capped by "man"-Bambi
  22. A raincoat donning Patrick Bateman axe-murders colleague Paul to the "clear, crisp sound" of Huey Lewis and The News-American Psycho
  23. Sonny is riddled with bullets in Barzini's tollbooth ambush -The Godfather
  24. A reformed Danny Vineyard learns that karma is a bitch-American History X
  25. Bill killed...-Kill Bill 2
  26. The Joker's makes a pencil "disappear""- The Dark Knight
  27. Dugan is crushed to death by a load of whiskey at the behest of union boss Johnny Friendly-On The Waterfront
  28. Leonard gets sniped atop Mount Rushmore-North By Northwest
  29. Carla Jean Moss loses the most important coin toss of her life-No Country For Old Men
  30. Kane kills Frank Miller- High Noon
  31. Maximus stabs Commodus in the throat-Gladiator
  32. Alonzo Harris is ambushed by the Russians-Training Day
  33. Leonard Shelby murders in reverse-Memento
  34. Barrigan ambushes Costigan and Brown, only to be taken out himself by Sullivan in a finale worthy of Shakespeare-The Departed
  35. Satan tosses Saddam Hussein from a cliff; impales his former lover on a mean-looking spike- South Park: Bigger, Longer, and Uncut
  36. Exley shoots Captain Dudley in the back-LA Confidential
  37. Li'l Dice is gunned down by the Runts- City of God
  38. Connor and Murphy dispose of 8 Russian crime bosses in Nomeni Patri Et Fili Spiritus Sancti-The Boondock Saints
  39. Will Munny goes postal on Little Bill and the locals; offers a reunion in hell-Unforgiven

Great, great list. I think the Psycho shower scene as your #1 is probably indisputable. I would say that "the scene" from Nashville should be on here (though I won't add any descriptive details in case you haven't seen the film). I'd also say that the Taxi Driver finale should be much higher imo - perhaps #2 or close to the top. Also, I'd recommend 2 scenes from Von Stroheim's Greed (again, no details in case you haven't seen it). If the Wild Bunch massacres count as "murder scenes" then I'd say they surely each deserve a high position. Definitely, definitely the nightmarish finale of Hitchcock's Marnie. Finale of Zulawski's Possession, though you probably haven't seen that. Roy meets his maker in Blade Runner (particularly the final cut version). Hall of Mirrors finale of Welles' Lady from Shanghai...

How about the actual JFK assassination footage from Oliver Stone's JFK? I'm halfway kidding (does previously made footage implemented into a film count?), though if you do decide to add it, it's perhaps the only "scene" I can think of right now that might be #1 over Hitchcock's Psycho.

Though there's tons more to recommend, that's all for now :-)