BOSTON (WHDH) -- A female bicyclist was struck and killed by a tractor-trailer in South Boston Monday afternoon.

The woman was struck in the intersection of A Street and West Broadway at about 4 p.m.

Witnesses say the woman was struck and dragged by the truck before it came to a stop. They described the scene as gruesome.

“I guess they were going in and out of traffic and the tractor-trailer was turning this way and she was crossing the street and he didn’t see her and he just dragged her,” said Kelly Yeo, a witness.

“The truck behind me come into contact with a female as the truck was travelling westerly on A Street turning left onto West Broadway. At that point, they came into contact and she is now deceased,” said Chief Bruce Holloway, Boston Police Department.

Witnesses watched in horror as the man -- who was with the victim -- broke down.

“I just saw, I guess the boyfriend. He was freaking out, throwing himself on the ground. I saw a mangled white bicycle off the corner. And the waitresses from the restaurant across the street trying to calm him down. He was beside himself. The truck driver as well, he was out and he was just shaking his head, holding his head and he just -- you could see he was just almost convulsing he was shaking so badly,” said John Libonati, owner of Social Wines.

The driver is cooperating, according to investigators.

“There’s trucks that come around, try to make this turn, that turn, and it’s definitely not an area for trucks. There’s not enough room for a truck to actually make a turn over here,” said Libonati.

The entire area was roped off and traffic was diverted while police investigated.

The driver of the truck has not been cited, according to police.