TORONTO — A married couple in their 70s died in a midday shooting Monday in the parking lot of Providence Healthcare in Scarborough, and Toronto police say the woman was a patient at the hospital when she was killed.Officers were called just after 12:30 p.m. to the south lot at Warden Ave. and St. Clair Ave. E. and found a man and a woman with gunshot wounds. Life-saving measures failed and both were pronounced dead at the scene. Duty Insp. Scott Shutt told reporters the pair are believed to have been married, a firearm was recovered on site, and there are no outstanding suspects and no threat to public safety. Homicide has taken the file.Shutt was asked whether the shooting was a murder-suicide and would not answer, calling it an ongoing investigation. He said no witnesses who heard the shots have come forward yet, even though “numerous people would have been aware of it happening after the fact,” and he urged anyone near the lot to seek support. Aerial video from the scene showed a wheelchair beside a grey vehicle with its trunk open.Providence Healthcare is a hospital and long-term care campus. Anyone with video or information is asked to contact Toronto police.