When Toronto police were first called to Sylvia Consuelo’s apartment near Rexdale early Saturday morning, they were told they’d be investigating a sudden death.

But a review of the building’s security cameras however revealed a chilling picture of man skulking through the hallways calmly and confidently with his face almost completely concealed.

The cameras captured the man going to her door and investigators say over the next hour, an autopsy proves that the 34-year-old woman was brutally sexually assaulted and suffocated to death.

“He knew his way around and up to her apartment,” Det.-Sgt. Hank Idsinga told reporters at a news conference Friday afternoon. “We will eventually find out more about the relationship between the two of them. I think he knows exactly what he’s going to do when he walks into that building. It’s unnerving to see how calm and cool he is when he walks out of there.”  

Her body was discovered by a group of her “acquaintances” who had gone to visit her at home, a source told CTV News. Police were called to the building at 4:45 a.m.

Consuelo suffered from mental health issues and police say she was also addicted to drugs. Though she was a mother to three children, she lived alone and supported herself by engaging in prostitution.

“This is an extremely vulnerable resident of our city,” Idsinga said.

The building is one of three in the same complex on Kendleton Drive, near Kipling Avenue and Albion Road. Idsinga described the building as being “very secure” and that the suspect came in through a back door from one building and made his way through a tunnel system to reach the building where Consuelo lived.

Because police believe he knows the area and the building well, they are going to canvas a large area of north Etobicoke in hopes of finding witnesses who can identify the suspect.

“Anyone who has any information whatsoever, please assist us,” Idsinga said.

Those who have information can call the homicide squad directly at 416-808-7400 or can leave an anonymous tip with Crime Stoppers at 416-222-TIPS (8477).