Sounds like a VFR pilot operating in IFR conditions. That’s never a good idea.
In fog, and a multi-engine plane? Not likely.
Assuming that the registered owner was operating the plane, Douglas Bourn has a commerical pilot certificate, with single-engine airplane, multi-engine airplane, instrument airplane, and rotorcraft ratings. He also has flight instructor certificates for single and multi-engine airplane, as well as advanced ground instruction.
It's more likely that he had some sort of problem, like an engine failure. Single-engine rate of climb in that plane is only 370 feet per minute, and any obstructions near the runway would be difficult to clear.