Question: what happened to lucas on pretty little liars?
Answer: "A" is seen fishing Lucas' shoe out of the water. Later, it's revealed that he is alive and well. He has just been laying low outside of Rosewood. He goes to Hanna's house and tells her why he has been acting strange: He gambled away his and Caleb's money and was scared that Hanna and Caleb would never forgive him.