As we previously reported, Hayes tragically died in Milton, Mass. last week at just 31 years old. A cause of death has not yet been publicly revealed.
Jimmy's wife, Kristen, and his brother, Philadelphia Flyers star Kevin Hayes, gave emotional speeches at the funeral Monday ... with Kristen saying, "You were simply the best. There's no other way to put it."
"The boys and I were your whole world," she added. "Every morning you would wake me up with, 'Hi, big momma' or, 'Big momma looking hot.' You said you felt bad that the boys will have the hot mom in the pickup line at school."
Kristen continued, "I will try my best to fill your shoes, but I know it's nearly impossible."
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Jimmy played winger for 7 seasons ... logging ice time with the Blackhawks, Panthers, Bruins and Devils. He retired in 2019.