After a four-day trial, a Grayson County jury has convicted 55-year-old Darwood Kellett of Irving of Aggravated Assault with a Deadly Weapon and Possession of Methamphetamine. Investigators say he was high on meth when he ran off US 75 and struck 23-year-old Leslie Karen Mercado. Mercado was standing in the parking lot of her workplace and died of her injuries. The jury sentenced Kellett to 20 years in prison.