The pair were both found guilty in October of six counts of first-degree murder for the so-called Surrey Six slayings in 2007. They face an mandatory life-sentence with no chance of parole for 25 years on those charges.
But Haevischer and Johnston were also found guilty of one charge each of conspiracy to murder rival gangster Corey Lal, and it is up to the judge to determine how long the sentence will be for that conviction.
The Crown prosecutors said they are asking for a maximum sentence. The defence is expected to speak after lunch.
The morning was taken up with nine victim impact statements read to the court.
Ellen Mohan, the mother of slain Christopher Mohan, cried as she read her statement. She told the court that Christopher's room remained untouched, as though she is still waiting for him to come home.
Two of the victims — Mohan, 22, and Ed Schellenberg, 55 — were innocent bystanders. Police said the two happened to be in the wrong place at the wrong time.
The other four victims, Ryan Bartolomeo, 19, brothers Michael Lal, 26, and Cory Lal, 21, and Edward Narong, 22, were described by police as having criminal lifestyles.