https://coloradohockeynow.com/2020/12/1 ... orget-him/Adrian Dater wrote a column on Lacroix. The exact cause of death was a heart attack. It appears likely it was a complication of his recent bout with COVID-19 but there's no confirmation of this.
Quote:
The bitter, ultimate irony about Lacroix’s life was that he had, in recent years, gotten back to robust, full health after some serious medical issues, including a bout with cancer. He was enjoying life in retirement, especially doting on his three grandchildren. He and Coco, in fact, spent the Thanksgiving holiday in the Boston area visiting grandson Max, who plays prep hockey there and currently is living in the home of Ray Bourque. Some time shortly after, however, Lacroix contracted the coronavirus. He was overcoming it, however, but on Sunday morning, Eric Lacroix said, he suffered a fatal heart attack. Whether that was connected to the virus or not is unclear.