NORTHAMPTON — Molly McGovern, the daughter of U.S. Rep. Jim McGovern and Lisa McGovern and sister to Patrick McGovern, died unexpectedly in Italy while visiting a friend and his family, according to a statement the congressman’s family issued Thursday morning.

“Even as she faced a rare cancer diagnosis, she did so with relentless courage, optimism, and tenacity — refusing to let her illness slow her down,” the statement reads.

Molly McGovern, 23, had just completed a semester abroad in Australia.

“Molly radiated pure joy. She lit up every room with her beaming smile — full of laughter, endless warmth and a sharp wit that could disarm you in an instant. She was unbelievably funny, fiercely loyal and wise beyond her years,” the statement reads. “Molly had a rare gift: She made everyone feel special, because she genuinely believed everyone was special. She treated people with compassion and kindness — always standing up for the underdog, and making fast friends wherever she went.

“Her love for the Boston Bruins was fierce, but it was no match for the love she gave so freely to her family and friends,” the statement continues. “If you ever met Molly, you carried a piece of her light with you. She had that kind of effect on people.”

Gov. Maura Healey offered condolences to the McGovern family from herself and First Lady Joanna Lydgate.

“I’m heartbroken for the McGovern family over the loss of their beloved Molly,” Healey said. “Molly was a light in her family’s lives and the lives of so many. She was a kind, smart and compassionate young woman who touched the lives of many.”

The McGoverns ended their statement expressing their love and admiration for Molly.

“Molly will always be the soul of our family. We are so proud of her and so glad that so many people were touched by her incredible life. We love you, Molly. We miss you already.”