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.
At 2 a.m. Saturday, Desper surrendered to West Goshen Police and was placed under arrest.
Police also recovered the truck and the suspected murder weapon.
We will update this story as more details become available. She was heading to Jacksonville University in Florida in the fall.
"Ballistics tests revealed the fatal bullet was sacked by a.40-caliber Smith & Wesson, which police reported finding in a bedroom at Desper's house", Chester County District Attorney Thomas Hogan said.
"Bianca Roberson, 18 years old, gunned down because somebody didn't wanna give way-somebody didn't want her to merge into a lane of traffic, and because of that, a young woman is dead today", said Hogan.
Responding police found Roberson's green Chevy Malibu in a ditch as it apparently veered off the road after the incident. The suspect fled the scene toward Route 202 and police say he was last seen turning onto a local road.
On Sunday, Chester County District Attorney Tom Hogan described Bianca's killing as a "savage and senseless murder".
He struggled to find words for the man who shot her. "He took a lovely young lady of 18 years of age in the prime of her life getting ready to go off to college, and for reasons that are incomprehensible to me, the family is now planning for her funeral instead of a going-away party for college".
At a Friday press briefing, police released a sketch of the suspected driver of the pickup, a man believed to be in his mid 20s to 30s, with a medium build, and blonde or light brown hair.
Images courtesy of NBC Philadelphia. The teen's father, Rodney Roberson, choked back tears as he spoke of his daughter's college aspirations. "She was excited. We were just happy for her".
'A young lady in the prime of her life getting ready to go off to college, and now the family has to consider burying her, ' West Goshen Police Chief Joseph Gleason said.
Her death is the second tragedy for the family, after Roberson's brother died four years ago.