BROOKLINE — A mother of three killed in a three-car crash on Christmas Eve was a big supporter of the volunteer fire department who responded to the fatal accident, Fire Chief Charles Corey said.“She was always there,” he said of Katie Hamilton, 30. “She was a very good person.”Corey said Hamilton’s firefighter father, Stephen Whitcomb, was in the second fire truck that responded to the accident scene Tuesday. He said earlier reports that Whitcomb had pulled his daughter from the wreckage were not accurate.Police Chief William Quigley had said Whitcomb pulled Hamilton from the car “without knowing it was her.”Hamilton was killed when her car was rear-ended and pushed into the path of an oncoming pickup truck, police said. Corey said he has known the family a “long time.” He said Hamilton would bring sandwiches to fire scenes and help with fundraising efforts.Stephen Whitcomb, along with being a volunteer firefighter, is the owner of a plumbing business he ran with his daughter.“Yesterday was my first day back after having my little girl,” an October 2011 post on the business’s Facebook page said. “We worked in an old house (changing) water pipes and putting heat pipes back together. I forgot how much I like working.”A Facebook page used by Katie Hamilton’s mother, Catherine Whitcomb, was flooded with messages of sympathy and well wishes on Christmas Day.“There are no words to say how much the heart hurts. Love you and so loved Katie,” one poster said.“I am just at a loss for words, Cathy. All I can say, is how very, very sorry I am. I loved Katie so much and she was such a joy to know. You all are in my thoughts and prayers,” another read.Hamilton was heading south on Route 13 at its intersection with Route 130 in front of the Brookline Safety Complex when her car was hit from behind by a Toyota Tundra driven by Greg Cullen, 31, of Milford.The impact sent Hamilton’s Ford Explorer into the northbound lane, where it was hit broadside by a Ford F-250 pickup truck driven by James Ciprotti, 37, of Weare. Ciprotti and Cullen were not injured. Police said as of Wednesday night no one had been charged in the crash.