According to ESPN, the Tigers' edge rusher was served outside the LSU football facility on Tuesday. Ole Miss had filed suit against Umanmielen and former offensive lineman Devin Harper this summer after the two had followed coach Lane Kiffin to LSU.
From ESPN:
Ole Miss officials requested payment from Harper and Umanmielen on Jan. 16 and Jan. 22, respectively, according to a timeline provided to ESPN in July. Neither player responded within the 30-day deadline to make the payment.
Umanmielen and Harper were served with a summons on Aug. 14 and didn't respond within the 30-day window.
The school accuses both Harper and Umanmielen of breaking the revenue-sharing contracts they signed with the school in January. According to the suit, both players signed new deals with Ole Miss in early January, when the Rebels were alive in the College Football Playoff. However, both players entered the transfer portal in the days after Ole Miss' loss to Miami in the semifinals and went to join Kiffin at LSU.