The 29-year-old was arrested later that day after a three hour manhunt.
Police allege Pasieka fatally stabbed 50-year-old Fitzroy Harris and 41-year-old Thierno Bah shortly after 2 p.m. when he entered the facility in the area of 161 Street and 121 A Avenue carrying two weapons.
Four other man ages 21, 29, 34 and 44 were also injured in the attack.
Police said at a Saturday news conference that the 34-year-old whose identity has not been made public remains in hospital in serious but stable condition.
Pasieka also faces charges for one count of attempted murder and two counts of possession an of an offensive weapon.
Police said further charges are pending.
One autopsy has been scheduled for Monday and the second autopsy will follow, police said.