When you watch NCIS Season 15 Episode 16 online, a sailor stationed overseas in Rota, Spain suddenly dies while training on the shooting range. When his body is sent back home for autopsy, Abby discovers that he was actually poisoned with cyanide cookies that came from a care package shipped from a retired Marine sergeant named John Ross, a man with a history of violent outbursts and emotional instability. Jack Sloane takes it upon herself to interview Ross and discover his story and whether he is actually the person behind the poisoned cookies, and she realizes that they have a great deal of life experiences in common. Meanwhile, a shock jock complicates the situation with inflammatory accusations, and the team finds it difficult to get useful information from the victim's relatives. And Torres is very distracted by his wrangling with an unfortunate situation involving the IRS from when he was undercover. Will he manage to straighten things out, or will he forever be caught in an inescapable web of entagling red tape? Will the team be able to determine the source of the cyanide, and was the unfortunate sailor in Rota a specific and sole target? Find out what happens when you watch NCIS Season 15 Episode 16 online!