The Senior Internal Security Investigator will be responsible for conducting non-field investigations of suspected fraud or illegal activities against the company. This role involves interviewing, database inquiries, taking statements, and locating sources of information and witnesses. The investigator will evaluate information credibility, refer cases to outside agencies, and provide training and support to various departments in the claims handling process. The position requires a mix of in-office and remote work, with two days in the office and three days working from home.