Police on Friday identified the person killed in a crash on Interstate 93 in Derry on Wednesday night.The victim was identified as Maya Muchnik, 78, of Needham, Massachusetts. State police said a tractor-trailer collided with a car on the southbound side near Exit 4 just after 6 p.m. Wednesday.Police said the tractor-trailer rear-ended a Lexus sedan, and the driver was killed. The name of the person killed has not yet been released.”We were just really shocked,” witness Amanda Shellman said. “We were worried, shocked, couldn’t believe what had happened, and we weren’t really sure what transpired with the accident, but we were worried, scared for the people involved and just hoping and praying they were OK.>> Download the free WMUR app to get updates on the go: Apple | Google Play <<A portion of the highway was closed until shortly after 11 p.m. when it was fully reopened. Fire officials said there was no water immediately available, but once tankers were brought in, they were able to put out the fire in about 16 minutes."You don't know what's going to happen, so just don't take any day for granted and always live it like your last because you don't know what's going to happen," witness Alexus Connor said.Police said the driver of the tractor-trailer was a 26-year-old from North Carolina. There was no word whether he was injured.There was no word on the cause of the crash or if any charges would be filed.Anyone with information about the crash is asked to contact Trooper Eric Torrens at [email protected] or 603-545-4396.