articleThe Brief A Tarrant County jury sentenced Valerian "Will" O'Steen to death for the murder of Marissa Grimes, a 26-year-old mother of two. A Tarrant County jury sentenced a man to death after he was found guilty of killing a young mother whose body was discovered hidden under his Fort Worth home. Jury Delivers Death SentenceWhat we know:A Tarrant County jury sentenced 28-year-old Valerian "Will" O'Steen to death for killing a 26-year-old mother of two in February 2022. The case was prosecuted by Tarrant County Assistant District Attorneys Allenna Bangs and Peter Gieseking. The Tarrant County Medical Examiner’s Office ruled her death a homicide caused by blunt force trauma to the head.