A Williston teenager is dead after a head-on crash Friday morning.  Just before 7 a.m. 18-year-old Michael Cuello’s vehicle crossed the center line and hit a pick-up on State Road 121 between 85th street and Wacahoota Road. Cuello was not wearing a seatbelt and was pronounced dead at the scene. Florida Highway Patrol spokesman Lieutenant Patrick Riordan says it will take time before the cause of the crash is determined. Cuello graduated from P.K. Yonge High School in June.