On second approach he reported "runway in sight" and the
ground officer quit giving directions...
They crashed few seconds later.
There was no distress call.
Unfortunately, this is a very possible outcome from a GCA (or any precision approach) to DH due to the illusion of a low horizon caused by OVC at or near DH. There is a natural tendency to descend below GP unless one eye is kept on a GP reference such as PAPI or VASIS (which it seems was inoperative).
Last GCAs I experienced, the controllers would continue with "information" calls for centreline and glidepath until touchdown after the pilot called visual. This was done to help prevent such possible departures.
Very sad indeed.