COLUMBIA, S.C. — Warrants allege that former “American Idol” contestant Caleb Kennedy was under the influence of marijuana when his truck crashed into a garage outside a home in Pacolet, killing a man. Kennedy, 17, was charged Tuesday with felony driving under the influence resulting in death and is being held without bond at the Spartanburg County Detention Center. If convicted, he faces up to 25 years in prison. Killed was Larry Duane Parris, 54, who died at 3:45 p.m. Tuesday at Spartanburg Regional Medical Center. The arrest warrants, taken out by the South Carolina Highway Patrol, state Ke…