Can someone please tell me who was LB The only thing I know
he took over Cotter Role on The Dukes of Hazzard For a while.

LB was Cooter's cousin.

Why was LB on in The First place what did happen to Cotter that made LB work at cotters Place

Ben Jones who played Cooter was holding out because the producers wanted him to shave and he thought Cooter should have that raged look. They won.

well if I was playing Cotter in The Dukes of Hazzard I would Hold out because I would want to look reged