An 18-year-old was arrested Wednesday in relation to a crash in August that killed a motorcyclist in Lincoln, according to authorities.Lincoln police said Alexis Kelly was taken into custody for motor vehicle homicide-DUI for the death of 28-year-old Pierce White on Aug. 29.Investigators said White had the green light when Kelly turned in front of him at 35th Street and Cornhusker Highway.According to Lincoln police, officers observed signs of impairment at the scene and conducted a drug recognition exam. Toxicology reports confirmed the presence of marijuana, law enforcement said.Previous in video at the top of the page