From Wikipedia.
"Sisyphus was the founder and first king of Ephyra (supposedly the original name of Corinth).[5] King Sisyphus promoted navigation and commerce but was avaricious and deceitful. He also killed travellers and guests, a violation of xenia, which fell under Zeus's domain. He took pleasure in these killings because they allowed him to maintain his iron-fisted rule."

Certainly rings a bell. It seems he never changed his ways until Zeus intervened. Interesting.