Tremont Street is usually packed with morning commuters just trying to get to work on time. But on Thursday morning, a normal bike ride turned into a nightmare that shook the entire local community. A popular young city planner was riding her bicycle to work when she was struck and killed by a truck. The loss has left local riders and residents feeling completely heartbroken.
Louisa Gag was only 36 years old. She was a bright light in the city and spent her whole career trying to make local neighborhoods better for everyone. In 2022, she joined the Boston Transportation Department as a bike-share planner, turning her passion for cycling into her daily job. She lived and breathed this work because she truly believed in public service.

The absolute gut-punch of this tragedy is that Louisa spent years advocating for safer streets. She wanted to protect people from the exact kind of accident that ended her own life. Now, the very people she worked with are trying to process the fact that one of their own is gone. Her friends remember her as an incredibly smart, optimistic person who always smiled through tough times.
Cops say the crash went down around 8:20 a.m. near Roxbury Crossing, right where Tremont and Parker streets meet. It is a busy, chaotic area that local cyclists have complained about for years. The truck driver stayed at the scene after the collision and is currently cooperating with the police. Investigators from the homicide unit spent hours checking out the area and blocking off traffic.
Louisa wasn’t new to this fight. She grew up in Roslindale, went to Boston Latin School, and later got her master’s degree in urban planning from Tufts University. Before working for the city, she spent six years with the LivableStreets Alliance. While she was there, she wrote big reports tracking how well local leaders were doing at making streets safer for everyday people.
Right now, grief is turning into real anger among local cycling advocates. People are pointing out that the city had plans to fix this specific stretch of Tremont Street to make it safer for bikes and buses. However, city officials recently paused that safety project, delaying the upgrades indefinitely. Advocates say this tragedy is proof that stalling these projects has real, deadly consequences.
Mayor Michelle Wu, who knew Louisa well from her days as an intern and fellow, expressed deep sadness over the loss. She called Louisa a dedicated public servant who made residents’ daily lives better. Local advocates say the only real way to honor Louisa now is to stop making excuses and start building safer bike lanes immediately so nobody else has to die on their way to work.
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