I listened to LiveATC during the last 15 minutes of the flight.
There was a Cessna 414, N37557, that was on top at 18,000 who reported they were in and out of the clouds, and that the clouds were higher up ahead. They were northbound according to FlightAware.
The Saratoga, N36402, checks in at 17,100, and asks to descend to 15,500. They are not flying IFR. The controller says VFR altitude at your discretion.
The controller tells N37557 that there is heavy precipation up ahead. N36402 hears this and asks the controller where is that aircraft, saying "Can I get over to their altitude and clear the clouds."
The controller says that N37557 is 1 mile east of the Shafter VOR at 18,000, and at your 11 o clock position and 30 miles. So that puts N37557 south of the Cessna 414.
Later the Saratogaa asks what is the bottom of the clouds, and the controller says he doesn't know, and reports that there is light rime icing up to flight level 19,000, southeast of your area (the direction I presume the Saratoga was flying).
The Saratoga says they are going to deviate to the south to Barstow.
The controller reports cloud tops up to 21,000 feet, and later 22,000 feet. The Saratoga says we will "Keep chasing the clouds to Palmdale."
Finally, the controller says "Do you want an IFR clearance to Henderson" and the Saratoga says "Yeah, I would take that." This confirms he was flying VFR. Someone posted that the pilot was not instrument rated, but he accepts an IFR clearance, so I don't know if he was instrument rated, or perhaps he wasn't and accepted an IFR clearance anyways because he was in trouble.
The clearance is Hector Victor 21 Boulder direct at 15,000. The Saratoga reads back the clearance, but he doesn't include V21 in his readback and the controller doesn't ask for it to be read back exactly. V21 is the direct route from Hector to Boulder.
Then the controller asks whether the Saratoga is for some reason turning northbound, and the pilot says "Roger, I just took a heading off of Bakersfield" and is changing to the current IFR clearance.
The controller then says fly a heading of 095 and there is no response. I assume this is for traffic.
The controller shortly later says more urgently for the Saratoga to made an immediate right turn to 095. A few seconds later the pilot says "mayday, mayday, mayday. About 15 seconds later, the pilot again says "mayday, mayday, mayday" more urgently and you can hear what appears to be screams in the background. That's the last transmission.
Why was this pilot flying VFR? Did he accept an IFR clearance without having an IFR rating? Even if he was IFR rated, did he accept a clearance at 15,000 that would put him in clouds. Was it icing or spatial disorientation? Lots of questions. Very sad.
Bob