A special prosecutor is asking a Texas judge to dismiss one of the higher-profile cases stemming from the fatal 2015 shootout involving bikers and police outside a Waco restaurant.

Special prosecutor Brian Roberts said Monday that no evidence supports charging Matthew Clendennen.

Clendennen was among more than 150 bikers indicted for allegedly engaging in organized criminal activity. Investigators say the shooting that left nine bikers dead and 20 injured was sparked by motorcycle club rivalries.

Clendennen's case drew particular interest because a judge imposed a gag order barring attorneys and investigators from publicly discussing it. Clendennen's lawyers successfully fought it, arguing it was overly broad, in an appeal supported by media outlets, including The Associated Press.

Roberts took over four biker cases after McLennan County's district attorney recused himself without explanation. About 120 cases are pending.