The search for fingerprints revealed a lot of prints that belonged to the victim, including on the whiskey bottles found around the house. On the broken photo frame we found two partial fingerprints, which were smaller than the ones belonging to (anonymised) and it is unlikely they were left by (anonymised).
Rolls-Royce Silver Shadow, belonging to the victim, bought 3 weeks earlier in London.
The car was in good technical condition, with only 327 miles on the odometer since it has left the showroom. Analysis shown that the engine was most likely switched off when the car emerged into the water, the brakes were off, parking brake was off, the key was in the ignition, but in OFF position. Headlights were switched off, radio was off, heating was off.
We found no damages on the chassis nor the car body. The front windows on the driver and passenger side were left with about 2 inch wide gaps, which let the water flow faster into the vehicle interior.
The garage is situated higher than the swimming pool, with a slightly sloped surface, which means it was possible for the car with engine switched off to roll down and into the pool. Later, it was proved by experiment that a car of similar mass could gain enough momentum on the sloped surface to drive over the edge of the pool.
Conclusion: it is possible that the car rolled down from the garage into the swimming pool without taking any damage in the process, however assuming the driver would be unconscious it is one in a million chance the car itself would keep the right angle to enter the swimming pool without hitting the sides.
The low table in the living room, next to a sofa, was found damaged. It looks like the decorative wooden panel was smashed off the tabletop edge. It is quite robust piece of furniture, which would suggest great strength must have been used to cause that damage.