The victim, whose name has not been released, was found lying on the side of road near mile marker 4.1 on Route 102. A motorist driving by called 911 at 6:44 a.m. to report seeing someone on the road.
According to the Berkshire District Attorney's Office, the DA has declined to file criminal charges after an investigation demonstrated that the truck driver's operation of his vehicle did not meet the legal criminal standard of negligence for charges to issue.
The crashes happened at 9:40 p.m. when a westbound Honda Accord on Dalton Avenue crossed the double yellow line, striking a Subaru sedan traveling east, causing it to spin out.
According to a police report, Laura Martin of Shaftsbury, Vt., was exiting Luce Road and pulled into the path of a vehicle driving east on Main Street at 5:22 p.m.
Authorities say the preliminary investigation suggests the 2-year-old boy died after his father, while fleeing the scene of a motor vehicle crash on foot, lost the child in Hudson Brook.