York Regional Police issued a Canada-wide arrest warrant for the man they allege shot two people to death and wounded two more inside Vaughan's Moka café earlier this summer.
Police say Jason Hay, 27, of Mississauga is wanted in connection with the slayings.
Christopher de Simone, 24, a regular café patron, and Maria Voci, 47, who worked at the eatery, were killed when a gunman opened fire on the morning of June 24.
Two other people were injured in the shooting.
York police have said the shooting appears to be targeted, but have not said who the target was. The police investigation also revealed an illegal gambling operation was being run out of the back of the café.
Shortly after the shooting, police released numerous surveillance camera images of the suspect, who covered his face with a grey hoodie during the attack.
York Regional Police found the Nissan Versa used as a getaway car — which they say was stolen from Napanee, Ont. in June — abandoned in an Etobicoke parking lot on July 1.
Police on Friday urged Hay to get a lawyer and turn himself in immediately. Police also warned anyone who helps Hay avoid police could be charged with accessory to a crime after the fact.
Const. Andy Pattenden wouldn't say how police identified Hay, but said investigators had received a large number of tips in the case.
Pattenden also said Hay has run afoul of the law before, though he declined to give specifics.
Police consider Hay to be armed and dangerous, and warned the public to contact 911 if they see him.