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Police are searching for a suspect who they say gunned down a recent high school graduate during a road rage incident in Chester County, Pa., on Wednesday.

Chester County, Pa., District Attorney Tom Hogan confirmed on Thursday night that 18-year-old Bianca Nikol Roberson was shot in the head by a man driving a red pickup.

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Roberson was traveling southbound on Route 100 in West Goshen Township toward Route 202 when she tried to merge.

“A red pickup truck merged in at the same time, and the man in the pickup truck pulls out a gun and shot her in the head killing her,” Hogan said. “This is now a murder case.”

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Bianca died instantly, and her car veered off the highway and slammed into a tree. The other car sped away onto Route 202 and continued on the Paoli Pike. Authorities discovered Bianca in her car, which was lying in a ditch.

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“To that person, to that man who fired that shot, turn yourself in now. Every second you are out there, you are only making this worse for yourself and making this worse for this young lady’s family,” Hogan said.

The suspect is described as a white man in his 30s or 40s, with blond or light-brown hair and a medium build.

Bianca had just graduated from Bayard Rustin High School two weeks ago and had plans to attend college. Now those dreams are abruptly ended. Pennsylvania Crime Stoppers is offering a $5,000 reward for anyone with information leading to an arrest or conviction in the crime.

Read more at CBS Philadelphia.