Oil pressure gauge drops to the red zone

Engines oil pressure gauge drops to the red zone and then car power meaning will not accelerate then car just shuts off now it will not start it just does one click. Where do I start to find the problem or is the engine locked up.

This vehicle was garaged for about 3 months with a bad A/C compressor, that was fixed so how would I tell if this vehicle had something added to the engine oil cause it would not be a big surprise I have terrible neighbors. There seems to be some weird deposits in the oil.

This vehicle did not have a knock coming from the engine area at all.