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A white off-duty constable shot and killed a paraplegic black man in Fayette, Miss., in 1965. Despite new witnesses who have memories of what happened that day, there's still not enough evidence to say whether Jasper Burchfield's claim of self-defense is true.

Authorities are offering $2 million for information leading to the capture of Joanne Chesimard, who was convicted in the murder of New Jersey State Trooper.

The FBI released photographs of three individuals who were on the grounds of the U.S. mission in Benghazi on the day of the attack, which killed four Americans, including the U.S. ambassador to Libya.

Authorities say J. Everett Dutschke ordered castor bean seeds on eBay and paid for them using his PayPal account. They were delivered to his house.

Federal agents who are investigating poison-laced letters that were sent to President Obama and others have arrested Everett Dutschke, of Tupelo, Miss. The Daily Journal of Tupelo reports that the arrest occurred around 1 a.m. Saturday.

The failure of the FBI and the CIA to keep track of Tamerlan Dsarnaev in the months preceding the Boston Marathon bombing has prompted criticism that U.S. law enforcement and intelligence officials ignored important warning signs. The case is reminiscent of criticism leveled at counterterrorism officials after Army Maj. Nidal Hasan's shooting rampage at Fort Hood Texas in November 2009 and after the al-Qaida-directed attempt to blow up a civilian airliner on Christmas Day of that year. In both cases, counterterrorism officials subsequently acknowledged that mistakes had been made. Whether authorities missed important evidence of Dsarnaev's intentions, however, is far less clear. Veteran intelligence officers say resource and legal constraints make it very difficult to follow suspicious individuals closely unless their behavior is genuinely alarming.

On Monday, FBI investigators said they had not found any trace of ricin in a search of Paul Kevin Curtis' home.

Eric Justin Toth, a former teacher in Washington, took Osama bin Laden's place on the FBI's Ten Most Wanted list.

The 45-year-old Paul Kevin Curtis is better known as an Elvis impersonator. His lawyers said he is being set up by an enemy.

Twenty years ago, federal agents clashed with David Koresh's Branch Davidian community near Waco, Texas. The standoff ended with a raid and fire in which some 80 children, women and men perished. It's remembered as one of the darkest chapters in American law enforcement.