A fifth bicyclist was killed in a crash in Boston this year. The 5th fatality was the 23-year-old bicyclist who was killed on Commonwealth Avenue in Allston today. He collided with a tractor-trailer as the vehicle was making a turn onto Saint Paul Street.

The mishap took place around 8:36 o’clock in the morning near Boston University’s Agganis Arena. The case is still under investigation by the Boston police fatal accident reconstruction team and Suffolk County prosecutors. No charges or citations have been issued.

The bicyclist was identified as Christopher Weigl, who was a graduate student at BU”s College of Communication. The faculty and students spent today mourning the death of one of their own, a clarinet-playing Eagle Scout who was eager to tell human stories with his camera.

Mitchell Zuckoff, a Boston University professor who worked closely with Weigl, who was in the first semester of the BU graduate program in photojournalism said that Weigl was a spectacular photojournalist. He was incredibly well-liked. He had all the tools you would ever hope for when thinking about hiring a journalist. Zuckoff said Weigl was avid outdoorsmen who spoke proudly of having been an Eagle Scout and would often show up in class carrying his bicycle helmet.

Last month another BU student, identified as Chung-Wei Victor Yang, was killed by a MBTA bus while he was riding through the intersection of Brighton and Harvard avenues in Brighton. No case was filed against the driver.

The crash today occurred on a main thoroughfare, where the Menino administration has established a painted lane for bicyclists as part of a campaign to encourage bike riding in the city.

A witness working at the CVS store at the intersection, Stanley Brown, said that he noticed the tractor-trailer making a right turn onto Saint Paul from the far left lane of Commonwealth and then saw the bicyclist racing down the avenue at a high rate of speed. He said the bicyclist then hit the truck. Brown said that he was sure that the bicyclist had been killed.

The operator of the truck got out of his vehicle, walked to the passenger side of the cab where he looked briefly at the bicyclist and then returned to his cab. He appeared shaken up, but did not show any obvious sign of intoxication or impairment, Brown said. The driver works for Ross Express, a Connecticut-based company.

Dot Joyce, spokeswoman for Boston Mayor Thomas M. Menino, said that the city transportation officials will investigate the circumstances of the crash. The area where the cyclist was killed has been marked as bike lanes. She continued that there is a need to educate cyclists and drivers and pedestrians about sharing the road and being respectful and responsible as they commute through the city.

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