FRONTLINE correspondent Martin Smith goes inside the dramatic hunt that uncovered the biggest insider trading scandal in U.S. history, drawing on exclusively-obtained video of hedge fund titan Steven A. Cohen, incriminating FBI wiretaps, and interviews with both Wall Street and Justice Department insiders.

On the night she broke up with her police officer boyfriend, Michelle O’Connell was found dead from a gunshot in the mouth. Next to her was her boyfriend’s semi-automatic service pistol. The sheriff’s office ruled it suicide—but was it? FRONTLINE and The New York Times investigate what can go wrong when the police are faced with domestic violence allegations within their own ranks.

Review this investigative biography of Oswald, the man at the center of the Kennedy assassination.

One hospital developed a unique program to encourage proper hand-washing hygiene.

Steven A. Cohen has been given a hypothetical: Would he be comfortable with his traders buying or selling a stock based on a tip from a reporter about an imminent negative news story. The hedge fund titan struggles to answer, saying, "It really comes down to where they heard that."

A deposition with Steven A. Cohen turns testy when the secretive billionaire is asked whether he takes seriously the issue of insider trading. Asked about his understanding of federal guidelines on trading nonpublic information, Cohen responds, "I rely on my counsel."

Hedge fund titan Steven A. Cohen spars with attorney Michael Bowe over whether traders at his firm, SAC Capital, must "strictly adhere" to the company's compliance manual.

Under investigation for insider trading, hedge fund titan Steven A. Cohen tells an attorney in a never before seen deposition that, "The way I understand the rules, they're very vague."

Has the age of antibiotics come to an end? From a young girl thrust onto life support in Arizona to an uncontrollable outbreak at one of the nation’s most prestigious hospitals, FRONTLINE investigates the alarming rise of a deadly type of bacteria that our modern antibiotics can’t stop.

In this clip from FRONTLINE’s League of Denial, neuropathologist Dr. Ann McKee discusses the brain of Penn football player Owen Thomas, who took his own life at age 21. After Thomas’s death, McKee conducted research on his brain and was shocked to find Chronic Traumatic Encephalopathy in the young defensive end.

The National Football League, a multibillion-dollar commercial juggernaut, presides over America’s indisputable national pastime. But the NFL is under assault as thousands of former players and a host of scientists claim the league has covered up how football inflicted long-term brain injuries on many players. FRONTLINE investigates: What did the NFL know, and when did it know it?

Pittsburgh Steelers center Mike Webster's favorite weapon was his head—and the hits kept on coming, for 17 years. In this excerpt from FRONTLINE's "League of Denial," Webster's peers describe what it was like to square off with "Iron Mike." Webster was diagnosed with chronic traumatic encephalopathy (CTE) after his death at age 50 in 2002.

In a deposition, secretive billionaire hedge fund manager Steven Cohen struggles to answer this question.

Two years after what seemed like a revolution in Egypt, FRONTLINE takes an in-depth look at the aftermath. From military rule to the Muslim Brotherhood's President Mohammed Morsi, and back again, we examine the military's dark side, the Brotherhood's mistakes, and meet Egypt's new leader, General Sisi.

More and more elderly Americans are choosing to spend their later years in assisted living facilities, which have sprung up as an alternative to nursing homes. But is this loosely regulated, multi-billion dollar industry putting seniors at risk? In a major investigation with ProPublica, FRONTLINE examines the operations of the nation's largest assisted living company, raising questions.

FRONTLINE's cameras were there to record the July 15 clashes between Islamists and the Egyptian military. Seven people were killed and more than 260 were wounded in the violence.

Since 1992, Bill Moyers has been following the story of two ordinary, hard-working families in Milwaukee – one black, one white – as they battle to keep from sliding into poverty. A remarkable portrait of perseverance, Two American Families raises unsettling questions about the changing nature of the U.S. economy and the fate of a declining middle class.

He was one of the guiding figures of FRONTLINE for more than two decades.

FRONTLINE and Univision partner to tell the story of the hidden price many migrant women working in America’s fields and packing plants pay to stay employed and provide for their families. This investigation is the result of a yearlong reporting effort by veteran FRONTLINE correspondent Lowell Bergman, the Investigative Reporting Program at UC Berkeley, and the Center for Investigative Reporting.

In Pakistan, women and girls who allege rape are often more strongly condemned than their alleged rapists. Some are even killed by their own families. For this unforgettable documentary, filmmakers Habiba Nosheen and Hilke Schellmann spent years tracing one alleged rape victim's odyssey through Pakistan’s flawed justice system—as well as her alleged rapists' quest to clear their names.