Three people were pronounced dead in the apartment, in Thorncliffe Park.
In a separate incident, paramedics said a man fell off the Leaside Bridge on to the Don Valley Parkway around 1:10 p.m.
He landed on a car and died at the scene.
The two incidents are believed to be related. A police source told CP24 that officers went to the man’s house and that’s where they found the three dead bodies.
Police said they are not looking for any suspects at t this time, but that the investigation is continuing. Developing.