An accident on Interstate 95 South in Waterford Sunday has claimed the life of a third person, state police said.

Sanaa Reynolds, who turned 9 on Sunday, died Tuesday at Yale-New Haven Hospital.

Reynolds, along with 2-year-old half-brother Dacari Robinson, died in a multi-vehicle crash. A Yale-New Haven spokeswoman said Darin Robinson, 26, who also was in the car, had died but did not have information on which day he succumbed to his injuries.

The trio were three of the four occupants in a Nissan Sentra traveling south on I-95, in the area just south of Exit 81. Police said the Sentra was slowing because of traffic congestion caused by several earlier crashes.

State police said a tractor-trailer registered to Gold Medal Bakery and driven by 58-year-old Gerard S. Dube of Swansea, Mass., also southbound, struck three vehicles: the Nissan Sentra, a Toyota Scion in front of the Sentra and finally a Dodge pick-up truck.

The driver of the Nissan, Baughnita Leary, 25, was treated for a possible head injury. The hospital spokeswoman said she did not have information for Leary. All are from Meriden.

More than two hours later, police would respond to another multivehicle crash near the same area. State police said a tractor-trailer driven by Kevin Custer, 60, of Swansea, Mass., struck three cars — one driven by Vikram Dhawan, 39, of New York; a second car driven by Cheryl Laffey, 59, of Waterford, and a third car driven by Jason Grant, 38, of Attleboro, Mass.

Police said Grant’s car struck a car driven by Adam Miller, age not available, of North Port, Fla. Miller’s car struck a vehicle driven by Andrew Southard, 32, of Allentown, Pa., who in turn struck a car that was driven by Gabriela Cajal, 44, of Clifton, N.J.

A passenger in Dhawan’s car sustained a serious injury. Saumya Arora, 33, was taken to Lawrence + Memorial Hospital in New London, where she was flown by Life Star helicopter to Yale-New Haven Hospital. She was listed in critical condition Wednesday.