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One morning in Sept. 2021, MaryAnn Harris felt strangely tired. She told her husband, Charles de Lint, that she needed to lie down. Then more worrisome symptoms began cropping up, from nausea to double vision.

The Ottawa couple rushed to a local emergency department. 

At first, the cause of Harris’s ailment was a mystery. The ER team ran various tests, and after a few hours with no answers, they sent her husband home due to visitor restrictions put in place during the pandemic.

By the time de Lint came back the next day, his beloved partner of four decades was unresponsive and on life support in the intensive care unit.

“You don’t know what to think, what to feel,” de Lint recalled. “It was just …