My understanding, from reading about this incident just after it happened on a US forum, was that the aircraft was in transit back to Canada. The airfield he took off from was very urban, and he actually impacted a bridge parapet. He had limited options. That is my understanding. I think he was also in his early seventies, and had a long transit prior to his fuel stop.
So, a number of things, starting with the wrong fuel being put in whilst he grabbed a coffee. Take it from there.....I assume most of us may not think, Christ, an idiot put the wrong fuel in the plane. But wait, it was a Malibu, the fueler may have looked at it and thought, that is a turbine, and so it goes on. Tired pilot, jumps in, and the engine quits on climb out. Very limited options in front. Bad luck he hit the bridge.....