A 12-year-old boy who was injured in a three-vehicle crash in Fountain died Monday night, the Colorado State Patrol said Tuesday.

A 5-week-old girl remained in critical, but stable, condition, Trooper Eric Zachareas said.

Eight people were injured in the wreck on U.S. 85/87 and Plaza Boulevard in Fountain around 1:50 p.m., closing the highway for nearly three hours.

Andrew Marsh, 45, of Colorado Springs, was traveling southbound in a 2005 Dodge Ram on the left lane, approaching Plaza Boulevard, while a 2004 Chevrolet Impala and a 2008 Toyota Tundra were stopped for a red light in the left lane, state patrol said.

The Dodge pickup struck the rear of the Impala, which pushed the car forward until its front end struck the back of the Toyota Tundra, Zachareas said.

The Dodge and Chevy both came to rest in the left lane, with the front of the Dodge embedded in the rear of the Chevy. The Toyota was shoved into the intersection, where it came to a stop.

Marsh suffered minor injuries and was treated and released from a local hospital. He was wearing a seatbelt, state patrol said.

The driver of the Chevrolet, 24-year-old Daniela Gray-Maldonado of Colorado Springs, and her front-seat passenger, 35-hear-old Regina Steckler of Calhan, were wearing seatbelts and sustained minor injuries, said Zachareas.

A 2-year-old boy and a 15-year-old girl seated in the back of the Chevy had minor injuries, but the 5-week-old girl and 12-year-old boy were airlifted to Memorial Hospital with life-threatening injuries.

The driver of the Toyota, 35-year-old Daniel Anthony of Fountain, also had minor injuries. He was wearing a seatbelt and was treated at a hospital and released.

State patrol said the wreck remained under investigation Tuesday.

State patrol did not clarify whether the children were wearing seatbelts.