UPDATED STORY HERE: Relatives of boy, 6, killed on Interstate 83 question absence of fence

A 6-year-old boy killed on Interstate 83 Tuesday was riding his dirt bike and lost control, according to his grandmother, whose back yard abuts the highway.

Bryce Treichler was struck and killed in the northbound lanes of the highway in New Cumberland just before Exit 39 to Lewisberry Road about 5 p.m.

Lynn Treichler said her grandson died in a "freak and tragic accident."

She is helping to raise several of her grandchildren from the home she shares with her mother, son and grandkids atop a small hill on Lincoln Drive, just to the east of the highway. Her son is Bryce's father.

Bryce was riding his motorized dirt bike in her back yard when he misjudged the hill and his momentum carried him onto the highway, where he was struck.

Police issued a report late Tuesday that said a 73-year-old driver struck the boy in the right travel lane, and the impact knocked the boy off his bike. The bike and boy landed on the embankment and shoulder, according to the updated police report.

Bryce was pronounced dead at the scene.

The family will need help with funeral expenses. To that end, an online fundraiser has been established.

State Police initially reported that the boy was seven years old, but his grandmother clarified that he was six.