A former Rhode Island disc jockey has pleaded guilty to an insurance fraud scheme involving a former North Providence town councilman recently sentenced on separate corruption charges. Lori Sergiacomi entered her plea Thursday in federal court in Providence. She’s scheduled to be sentenced Aug. 25. Sergiacomi — known on the radio as Tanya Cruise — admitted that she and three others conspired to damage her home and submit bogus insurance claims worth just over $40,000. Of her co-defendants, former North Providence Councilman John Zambarano and a former council president, Robert Ricci, already pleaded guilty.