Mosley, who teamed with Dallas Morning News columnist Tim Cowlishaw in afternoon drive for the last three years on the station also known locally as ESPN Radio, wasn't on the air Friday.
His latest contract -- a one-year deal -- expires in October. He and station management could not come to terms on a new agreement.
Mosley's and Cowlishaw's show, which airs 3 p.m. to 6 p.m., had been ratings-challenged. Their show consistently finished third in the sports talk ratings behind The Ticket's Hardline and "The Fan" KRLD 105.3 FM Ben & Skin.
Still, Mosley's and Cowlishaw's show consistently outrated its lead-in that featured Friedman and Steve Dennis, who worked 11 a.m. to 3 p.m. They also ran third in their time slot.
Speculation is that when the dust clears, Dennis will slide into Mosley's old seat alongside Cowlishaw, according to SportsDay at The Morning News. Their new lead-in could be Jean-Jacques Taylor and Will Chambers. Taylor confirmed on Facebook Friday that he will be the host of 11 a.m. to 3 p.m.