Brian Malley, who is 57, is charged with first-degree murder and two explosives-related counts.
The evidence presented at the voir dire cannot be made public.
Vicky Shachtay (SHAK'-tay) died in November 2011, when a hand-delivered package left on the doorstep of her townhouse in Innisfail blew up.
Shachtay, who was 23, was a single mother and used a wheelchair following a car accident.
The hearing is expected to last two weeks with Malley's trial to go ahead in January