65-year-old in critical condition after work dispute ends with a stabbing

A 56-year-old man is in police custody and a 65-year-old in critical condition in hospital after what appears to be a work-related dispute ended with a stabbing on Monday morning.
The incident occurred at about 8:40 a.m. Police received 911 calls concerning an argument that broke out in a restaurant on Lacombe St. near Côte-des-Neiges Rd. 
Investigators believe a former employee returned to the restaurant and became entangled in an argument with four of his ex-colleagues, one of them