Will Webster, the man that accidentally killed someone in a bar fight at the Waterfront, is referred to several times as a murderer. However as stated it was just a bar brawl, Webster intended to hit the victim with a beer bottle, but he did not intend to kill him, while being a homicide it is not murder. The bottle broke when it hit his head and unintentionally severed his jugular vein, making this an accidental death resulting from an intentional assault, which is the classic definition of involuntary manslaughter.
At around 31:40, as Pembleton points to the sky, and asks Kellerman "Is that Orion?", you clearly see the boom mic.