Jimmy Hayes' Wife Devastated Over Ex-NHLers Death, 'This Isn't Fair'

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, MA on Monday. No additional details have been released surrounding the death.

Boston College and the Chicago Blackhawks both released statements mourning his passing Monday, with the 'Hawks writing, "We are heartbroken."

Hayes -- whose younger brother, Kevin Hayes, currently plays for the Philadelphia Flyers -- is survived by his wife, Kristen, and their two sons, Beau and Mac.

He was just 31 years old.