Bianca Nikol Roberson, 18, was fatally shot during what police described as a "cat-and-mouse" encounter with another motorist while driving southbound on Route 100 Wednesday night.
He called the killing a "savage, senseless and brutal act".
At 2 a.m. Saturday, Desper surrendered to West Goshen Police and was placed under arrest.
Roberson lived in nearby West Chester and just graduated from Bayard Rustin High School.
Desper had a permit to carry the gun, which he purchased in November 2015, Hogan said.
After the shooting, township police, Chester County Detectives and another law enforcement agencies began a manhunt for the shooter, working from eye witness accounts, sharing details through local media and social media, both of which township Police Chief Joseph Gleason credited for the swift conclusion of the case. Chester County District Attorney Tom Hogan said, "They jockeyed for position and he wasn't happy, so he pulled out a gun and shot Bianca in the head, killing her instantly".
New information expected in teen's road rage killing
West Chester District Attorney Thomas Hogan announced that the man wanted in connection with the road rage shooting has turned himself in. It was found in Desper's bedroom, authorities say.
Police also recovered the truck and the suspected murder weapon.
Court records show Desper has been charged with first-degree murder, third-degree murder, criminal homicide, possession of an instrument of crime and recklessly endangering another person.
He struggled to find words for the man who shot her.
Anyone with information about this incident can contact the West Goshen Police Department directly at 610-696-7400. "Every second you are out there you are only making this worse for yourself and making this worse for this young lady's family". This fall, she was supposed to enroll at Jacksonville University in Florida for her college education. That's what the teen's grandmother said to herself as she passed the crash site Wednesday, intending to meet up with her granddaughter at home.