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Editor's note: Investigating authorities were trying to confirm the 13-year-old's legal last name amid some confusion. A previous version of this report referred to him as Casey Ishak.
A Fort Worth man and his teen-age grandson were killed and the boy's mother and sister hospitalized Sunday after a tractor-trailer rammed a line of slow-moving vehicles near Gainesville.Gervious Hinkle died at the scene and Casey Hinkle, 13, also of Fort Worth, was pronounced dead about an hour later, said Trooper Mark Tackett, spokesman for the Texas Department of Public Safety highway patrol.They were northbound on Interstate 35 about 2:30 p.m. in a 1996 Ford Explorer when they encountered a traffic delay created by road construction, Tackett said.About six miles south of Gainesville, a rig driven by Randy Crume of Harrah, Okla., came upon the slowed traffic, Tackett said."Crume failed to control speed and struck the rear of the stopped traffic," causing "multiple collisions," Tackett said.Eight vehicles and the tractor-trailer, a 2006 International, were damaged.Casey Hinkle was pronounced dead at 3:39 p.m. at John Peter Smith Hospital in Fort Worth, according to the Tarrant County Medical Examiner's Office.His mother and sister were also taken to hospitals, Tackett said, but their conditions were unavailable Monday afternoon.Tackett said troopers were still investigating the wreck.This was the second time in recent weeks that North Texans were killed in a chain-reaction wreck involving a big rig.A family of three from Frisco and a relative were among 10 people fatally hurt June 26 in a pileup on Interstate 44 near Miami in far northeast Oklahoma.Killed were Randall Hayes, 38, and his 7-year-old son, Ethan. Hayes' wife, Shelby Hayes, 35, died two days later at a hospital in Missouri. Her mother, Cynthia Olson, 55, of Crossroads in Denton County, also died in the crash.A tractor-trailer slammed into cars that had stopped on the highway because of a previous accident, according to reports.The latest statistics from the National Highway Traffic Safety Administration show that, in 2007, there were 4,808 fatal wrecks involving large trucks in the United States, and that 405 of them were in Texas.

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