Oklahoma fired offensive coordinator Seth Littrell on Sunday night, a day after the Sooners scored only nine points in a blowout loss to South Carolina, according to On3’s Sooner Scoop. The former North Texas head coach was promoted from an analyst role last offseason by Brent Venables after former offensive coordinator Jeff Lebby took the Mississippi State job. The Sooners’ offense struggled for much of the season. Quarterback Jackson Arnold started the first four games of the season, before being benched for Michael Hawkins. The true freshman made starts against Auburn, Texas before throwing…