KFOR has confirmed Mike Stoops is out as Oklahoma's defensive coordinator.
Stoops' Sooner defense gave up more than 500 yards of total offense in a 48-45 loss to Texas on Saturday.
It was the most points the Longhorns have ever scored in the Red River Rivalry.
Stoops has been OU's defensive coordinator since 2012, after spending eight seasons as the Arizona head coach, following his first stint at OU as defensive coordinator from 1999 to 2003.
Stoops is the younger brother of former OU head coach Bob Stoops.
Sources indicate there was a meeting between Mike Stoops, head coach Lincoln Riley, and OU president James Gallogly and the result of that meeting was the ouster of Stoops.
OU defensive specialist Bob Diaco is the leading contender to replace Stoops for the rest of the season.
Diaco joined the staff this season after being Nebraska's defensive coordinator last year and the head coach at Connecticut for three seasons before that.
Oklahoma players reacted to Stoops' dismissal on Twitter: