is the sixth episode of the 13th season of the long-running police procedural series NCIS . It originally aired on October 27, 2015 , on CBS. Plot Overview
The NCIS team investigates the murder of a Navy Petty Officer whose death appears to mimic the M.O. of a notorious local serial killer known as the . The investigation focuses on determining whether the victim is the sniper's latest target or the work of a copycat killer. Key Storylines [S13E6] Viral
Viral (2015) * Mark Harmon. Leroy Jethro Gibbs. * Sean Murray. Timothy McGee. * Michael Weatherly. Tony DiNozzo. * David McCallum. The Movie Database is the sixth episode of the 13th season