Former Alberta premier and three others killed in Citation crash in B.C.

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From TSB:

Aviation Investigation A16P0186 - Transportation Safety Board

What we know

• A Cessna Citation departed Kelowna, British Columbia (CYLW) at 21:32 (Pacific Daylight Time), destined for Calgary/Springbank Airport, (CYWB).
• The aircraft struck terrain approximately 11 km north of Kelowna Airport at approximately 21:40 local time (Pacific Daylight Time).
• At this time we believe there was one pilot and 3 passengers on board, all of whom sustained fatal injuries.
• The aircraft was not equipped with, nor was it required to carry, a Cockpit Voice Recorder (CVR) or a Flight Data Recorder (FDR); however, the team will be reviewing any electronic components on the aircraft from which they can retrieve data to help understand the flight profile.
• The air‎craft was destroyed from high deceleration forces after a vertical descent.
• There were no emergency or distress calls made. No emergency locator transmitter signal was received.

Many news outlets report the accident A/C disappeared from radar at an altitude of 8,600 feet. Would be interested to know the source of that info.