Five high school students in Michigan are accused of throwing rocks off an overpass and killing a man.

Kenneth White, a 32-year-old father of four, was riding home last week when a rock hit and killed him. The five suspects are 15 to 17 years old. They are all charged with second-degree murder.

The teenager who prosecutors believe actually dropped the rock is 17-year-old Kyle Anger. Anger is being held at the county jail while the rest are at a juvenile detention facility. All of them were arraigned Tuesday and are being tried as adults, CBS News correspondent Adriana Diaz reports.

The five teenage defendants were expressionless as their lawyers entered not guilty pleas for them. Their distraught families watched the proceedings, as did the grieving father of Kenneth White, the 32-year-old victim.

 "I've buried my mother, my father, and my oldest brother in the last four years. This is the hardest thing I've ever did in my life," White Sr. said.

Police say White, a construction worker, was getting a ride home in a Ford Econoline van around 8:30 pm last Wednesday. That's when a six-pound rock, about five inches wide and eight inches long, was allegedly dropped from an overpass and crashed through the windshield.

The victim, Kenneth White Jr.

The father of four was struck in the face and chest.  He was declared dead on arrival at the hospital.  

"It's not a prank. It's second-degree murder," said Genesee County Sheriff Robert Pickell.

Officials say the suspects went to McDonald's after the incident. Investigators say they found at least 20 rocks on Interstate 75 including one that weighed more than 20 pounds.  

Frank Manley and Fred Meiers represent two of the defendants, Mark Sekelsky and Trevor Gray.

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