Former Oklahoma cornerback Parrish Cobb has been sentenced to 18 years in prison after he pleaded guilty to aggravated robbery in his hometown of Waco, Texas. Cobb, 20, was sentenced Monday after pleading guilty to robbing a Baylor student at gunpoint in 2017. According to the Waco Tribune-Herald, prosecutors agreed to dismiss two other armed robbery charges against Cobb as part of a plea deal. Cobb, who started two games for the Sooners in 2016 as a freshman, still faces an unrelated robbery charge in Norman. OU gets 3-star offensive lineman commitment Marcus Alexander, a three-star offensive lineman from Sunnyvale, Texas, announced his commitment to Oklahoma on Tuesday morning. Alexander chose OU over offers from Oklahoma State, Texas Tech and Missouri, among others.Read more on NewsOK.com