What happened to the Master of Lake-Town after the events of the Hobbit?
Balin and Gandalf, at the end of the book, tell Bilbo of the fate of the former Master of Lake-town:
The old Master had come to a bad end. Bard had given him much gold for the help of the Lake-people, but being of the kind that easily catches such disease he fell under the dragon-sickness, and took most of the gold and fled with it, and died of starvation in the Waste, deserted by his companions.
"The new Master is of wiser kind," said Balin, "and very popular, for, of course, he gets most of the credit for the present prosperity. They are making songs which say that in his day the rivers run with gold."
The Lake-town Sourcebook for The One Ring Roleplaying Game goes a step farther (in a letter from the Dwarf Glóin, son of Gróin, to Bilbo Baggins) and names the new Master of Esgaroth as "the former captain of the guard, the first Man of the Lake we met when we first set foot on the bridge to the old Lake-town."