Two people have been arrested in the shooting death of a college student, originally reported as a botched robbery and now believed to be a drug deal that went bad, authorities said. Ryan Weston Darville, 21, of Dalton, and Jermaine Lamar Spivey, 22, have been charged with murder in the death of Thomas Dexter Canavan, a 19-year-old student from Jackson. Darville shot Canavan in the chest after trying to grab marijuana from him without paying, sheriff's officials said. Canavan was a freshman majoring in chemistry at Georgia College & State University in Milledgeville. He and three friends had arranged to meet an unknown person July 7 to sell marijuana, Whitfield County Sheriff Scott Chitwood said. Allen Norris, 19, Adam Norris, 17 and Tyler Brackett, all of Dalton, were with Canavan in the car when he was killed.