Wake Turbulence
The Lear 45 was reported as following a Mexicana B767-300.
I'm sure most recall American Flight 587 Airbus in New York that crossed into the wake of a departing JAL B747 after 9-11.
To date, there was a Massey-Ferguson Lear 25D at Detroit Metro that passed thru the wake turbulence of a departing DC-9 and crashed, a Dept. of Energy Citation 550 knocked out of the sky by a B757 wake turbulence in Montana.
Martin Aviation Westwind 1124 carrying In/Out Burger's CEO crashed near John Wayne after encountering wake turbulence of a Northwest B757, and a MS760 Paris Jet also landing at John Wayne crashed in Irvine after encountering a United B757 wake turbulence.
So of course we don't know, but certainly possible. 'Black Box' was reported as recovered, so in the long run, factual answers shall be forthcoming.