In Frankenstein, what does Walton discover when he enters Frankenstein’s cabin after Frankenstein has died?

When Walton enters Frankenstein's cabin after Frankenstein has died, he discovers the creature standing over the body of Frankenstein, mourning his creator. The creature expresses his deep sorrow over Frankenstein's death, feeling remorseful for all the pain and suffering he has caused. Walton is shocked by the creature's presence and the sad scene before him.