Beef was a member of Laughing Jack's crew on his ship The Lady Luck. Beef later became an undead human with the rest of the crew, forced to row the ship forever.
Isle of the Dead
Lief and Barda encountered Beef when they spent their time on The Lady Luck. They saw him in the vision that the painting showed them. When they were about to escape the undead rowers came after Lief and Barda. Beef was most likely among them.
Beef had a hulking figure and wore a black patch over one eye. He resembled a brute.
Beef was easily persuaded especially when it came to gold or money. He failed to see through Laughing Jack's lies even when Coffin warned the crew about their fate. He also had a violent nature as he did not hesitate to murder Coffin.
Beef could row reasonably well after serving on The Lady Luck for quite some time.