A 28-year-old cyclist was fatally stabbed after stepping in to protect a mother and her two children from a knife-wielding suspect at a San Francisco train station on July 26, according to law enforcement and court records, as reported by the New York Post.

The victim, Colden Kimber, a student at San Francisco State University, was waiting at the Ingleside Muni stop with his girlfriend following a lunch date when the suspect, Sean Collins, 29, allegedly began harassing the nearby family.

Colden Kimber, 28, was fatally stabbed while protecting a mother and her children from an aggressive man at a San Francisco train station on July 26. The New York native intervened when suspect Sean Collins, 29, began harassing the family at the Ingleside Muni stop, court… pic.twitter.com/0ykqX50nSp

— TheSeekingSeagull (@TSSeagull) August 4, 2025

According to court documents obtained by KGO, Collins shouted, “Oh, you think you are better than me,” and “You are scared of me,” at the woman and her children.

Kimber intervened by placing himself between the family and Collins. As he turned toward an approaching train, Collins allegedly stabbed Kimber in the neck with a six-inch blade.

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Authorities described the incident as a “completely and utterly unprovoked attack.” Surveillance footage captured the stabbing, and Kimber collapsed at the scene while bleeding heavily.

Beloved San Francisco cyclist stabbed in the neck and killed in an unprovoked attack while trying to protect a woman and her kids from a crazed junkie. I hope you’re sitting down, but the junkie was out on bail, and this is just another senseless murder in Gavin Newsom‘s lawless… pic.twitter.com/VU7ND68xKP

— Kevin Dalton (@TheKevinDalton) August 2, 2025

Emergency responders transported Kimber to San Francisco General Hospital. He underwent surgery but died from his injuries, according to his mother, Lara Litchfield-Kimber, who shared details on a GoFundMe page that has raised over $91,000.

“There is no making sense of this and no words to convey the devastation we are feeling,” she wrote.

Originally from Dryden, New York, Kimber had a passion for cycling and was employed at American Cyclery, a local bicycle shop where he had worked for three years.

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“He was a very positive influence on myself and my staff,” said shop owner Bradley Woehl.

“He is totally irreplaceable as a worker, and totally irreplaceable as a friend and person.”

Kimber’s interest in cycling began when he filled in for his mother during the New York Triathlon after she had to withdraw due to a breast cancer diagnosis.

“He had never ridden a bike on a road,” she told the San Francisco Chronicle. Afterward, cycling became a central part of his life. “People would say, ‘I had a Colden sighting,’ because it wasn’t that rare—he was always on his bike,” she said.

The suspect, Sean Collins, was arrested near the scene shortly after the incident. He was charged with murder and is scheduled to be arraigned on August 14.

A memorial bike ride in Kimber’s honor is scheduled to take place on September 7.

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