Garrett Mason (L.A. Noire)

The Black Dahlia Killer is The Main Antagonist in the homicide cases in L.A Noire

Murder Streak
The killer murdered Elizabeth Short to start his horrific murder streak.

The killer then proceeded his horrific murder streak during Homicide Detectives Cole Phelps and Rusty Galloway's time on homicide

The Murderer Brutally murdered Celine Henry, Deidre Moller, Antonia Maldonado, Theresa Taraldsen, Evelyn Summers.

Identified
The Murderer sent various letters to the homicide department, each of which deciphered to a specific location and gave them a previous victim's token, Detectives Cole Phelps and Rusty Galloway proceeded to locate them.

Eventually The final note led the detectives to The Christ Crown of Thorns(Abandoned Church) where they located The Murderer.

The Detectives jumped for cover as The Killer shot a shotgun blast at them, this allowed The Killer to jump into a secret passage.

The Detectives then proceeded into The Church house nearby, they then found the Den of The Murderer, aswell as a secret passage into the church's catacombs.

Death
Cole Phelps chased The Murderer through the tunnels while The Murderer taunted Phelps(Asking why he joined The LAPD, Seeking the confession as of Personal Redemption) The Chase concluded in The Church's Graveyard, where Phelps and The Killer took cover, The Murderer jumps out and fires at ransom while Phelps popped out and Shot Two Shots into The Murderer's Skull, ending The Killing spree and The Homicide Desk.

Case Conclusion
Phelps then went back to Galloway and Cpt. Donnelly, The captain then revealed That The Murderer was related to a very important politician, revealing that the public could not know about The Killer's identity, The Captain revealed that he would release all previous suspects silently, Phelps is then promoted to Vice.