Jimmy Hayes' wife says she's devastated over the death of the former NHL player ... writing on her social media page on Tuesday, "I don't know how I'm going to do life without you."
Kristen Hayes posted the heartfelt message on her Instagram over a picture of Jimmy, adding, "My angel, I love you so much. I miss you."
"You should be here," she continued. "This isn’t fair."
Jimmy -- who played 7 years in the NHL -- was reportedly pronounced dead at his home in Milton, Mass.