Patrick Shorey, 25, was charged last week with manslaughter. The crash, which happened on Route 27, claimed the life of a woman from Connecticut.
"It appears that he crossed the center line and struck the Blouins' vehicle in their lane," Detective Scott Hayden of the Lincoln County Sheriff's Office said.
The lead detective in the case, Hayden said that Shorey was under the influence of methanphetamine when driving south on Route 27.
Investigators said that Shorey swerved into the northbound lane, colliding head on with a car and killing 75-year-old Carolyn Blouin of Rockville, Connecticut.
"We called a deconstructionist to reconstruct the [crash] scene as well as a forensic mapper," Hayden said.
Hayden blamed the year-long delay in charging Shorey on staff changes at the district attorney's office.
The Lincoln County clerk's office said Shorey does not have an attorney.
Shorey is scheduled to appear in court in November.