CSI: NY follows a group of investigators who work for the New York City crime lab. The series mixes gritty subject matter and deduction in the same manner as its predecessors, yet also places a great deal of emphasis on criminal profiling. The team is led by Detective Mac Taylor, a former Marine from Chicago. Mac, a veteran of the NYPD, lost his wife on 9/11, and as such must work to rebuild his personal life while supervising his team. He is organized, efficient, dedicated, and very proper in his management style. Mac's partner is originally Stella Bonasera. Stella is half-Greek, half-Italian, and entirely New York City. She helped Mac through the impact of his wife's death and has been by his side ever since. She is a savvy investigator, yet she often speaks before she thinks. Stella leaves New York to head a crime lab in New Orleans and is replaced by Detective Jo Danville. Jo is a former FBI criminalist and an experienced psychological profiler. She and Mac quickly form a strong friendship and an even stronger working rapport. Jo is still haunted by her ousting from the FBI after blowing the whistle on improper lab procedure, so she works to regain her professional reputation. Together, Mac, Stella, and Jo head an elite team of detectives including Danny Messer, Aiden Burn, and Lindsay Monroe. The team also works alongside CSI Sheldon Hawkes, Detective Don Flack, Medical Examiner Sid Hammerback, and CSI trainee Adam Ross.