Chargers linebacker Shawne Merriman filed a copyright and trademark infringement lawsuit yesterday against reality television star Tila Nguyen, alleging she posted pictures of Merriman and used his "Lights Out" trademark on her Web site without permission. The federal lawsuit alleges that Nguyen, also known by her stage name Tila Tequila, used the pictures to drive traffic to her site so visitors would purchase goods and services such as music and jewelry and VIP services. Merriman, who runs a business called Lights Out Holdings, said he had been negotiating an agreement with Walmart stores for the distribution of T-shirts and according to the suit, Walmart has "delayed" its dealings with Merriman. Merriman also said his relationship with the Chargers has suffered because of Nguyen's statements and actions. "All I can say is there is a lot of untruths out there. It's not fair," Merriman said after practice yesterday. "To a certain point, when things are said that are totally bogus, you have to stick up for yourself." .