Watch NCIS: New Orleans Season 1 Episode 15 online to dive right into a New Orleans Mardi Gras celebration that ends badly for a Naval petty officer. Pride and his team investigates after Petty Officer Toussaint Patrice is stabbed to death during the festivities. Their quest for the truth leads them to a club Patrice had no business being at, which only raises more questions. His wife has no idea why her husband, three years sober, would be there. When they find his car, more red flags pop up. The team must discover the truth quickly before more bodies drop during New Orleans's biggest and wildest party of the year. Why was Petty Officer Patrice at the club, and why did he have a heavy-duty gas mask with him? And why is someone stealing medical anesthetics from local warehouses? Meanwhile, Agent Pride is alarmed to discover that his daughter Laurel has been secretly in contact her grandfather, Pride's father Cassius, in prison. There is no love lost between Pride and his father, and Pride has repeatedly refused to write a letter to the parole board. Will Pride tell Laurel the truth about her grandfather? Find out the answers when you watch NCIS: New Orleans Season 1 Episode 15 online.