June 12, 2006 - The Supreme Court rules that death row inmates can challenge the use of lethal injection as a method of execution.
December 15, 2006 - Florida Governor Jeb Bush suspends the death penalty after the execution of prisoner Angel Diaz. Diaz had to be given two injections, and it took more than 30 minutes for him to die.
December 15, 2006 - Judge Jeremy Fogel of the U.S. District Court in San Jose rules that lethal injection in California violates the constitutional prohibition of cruel and unusual punishment.
December 17, 2007 - Governor Jon Corzine signs legislation banning the death penalty in New Jersey. The death sentences of eight men are commuted to life terms.
September 2007 - The U.S. Supreme Court takes up the case of Baze and Bowling v. Rees, in which two Kentucky death row inmates challenged Kentucky's use of a three-drug mixture for death by lethal injection.
December 31, 2007 - Due to the de facto moratorium on executions, pending the Supreme Court's ruling, only 42 people in the U.S. are executed in 2007. It is the lowest total in more than 10 years.
April 14, 2008 - In a 7-2 ruling, the Supreme Court upholds Kentucky's use of lethal injection. Between September 2007, when the Court took on the case, and April 2008 no one was executed in the U.S.
March 18, 2009 - Governor Bill Richardson of New Mexico signs legislation repealing the death penalty in his state. His actions will not affect two prisoners currently on death row, Robert Fry, who killed a woman in 2000, and Tim Allen, who killed a 17-year-old girl in 1994.
November 13, 2009 - Ohio becomes the first state to switch to a method of lethal injection using a single drug, rather than the three-drug method used by other states.
March 9, 2011 - Illinois Gov. Pat Quinn announces that he has signed legislation eliminating the death penalty in his state, more than 10 years after the state halted executions.
March 16, 2011 - The Drug Enforcement Agency seizes Georgia's supply of thiopental, over questions of where the state obtained the drug. U.S. manufacturer Hospira stopped producing the drug in 2009. The countries that still produce the drug do not allow it to be exported to the U.S. for use in lethal injections.
May 20, 2011 - The Georgia Department of Corrections announces that pentobarbital will be substituted for sodium thiopental in the three-drug lethal injection process.
July 2011 - Lundbeck Inc., the company that makes pentobarbital (brand name Nembutal), the drug used in lethal injections, announces it will restrict the use of its product from prisons carrying out capital punishment. "After much consideration, we have determined that a restricted distribution system is the most meaningful means through which we can restrict the misuse of Nembutal. While the company has never sold the product directly to prisons and therefore can't make guarantees, we are confident that our new distribution program will play a substantial role in restricting prisons' access to Nembutal for misuse as part of lethal injection." Lundbeck also states that it "adamantly opposes the distressing misuse of our product in capital punishment."
July 7, 2011 - Humberto Leal Garcia, Jr., a Mexican national, is executed by lethal injection, in Texas for the 1994 kidnap, rape and murder of Adra Sauceda in San Antonio. Despite pleas from the U.S. State Department and the White House, Texas Governor Rick Perry does not grant clemency and the U.S. Supreme Court does not intervene.
November 22, 2011 - Governor John Kitzhaber of Oregon grants a reprieve to Gary Haugen, who was scheduled to be executed December 6. Kitzhaber, a licensed physician, also puts a moratorium on all state executions for the remainder of his term in office.
April 25, 2012 - Connecticut Governor Dannel Malloy signs S.B. 280, An Act Revising the Penalty for Capital Felonies, into law. The law goes into effect immediately and replaces the death penalty with life without the possibility of parole. The law is not retroactive to those already on death row.
June 22, 2012 - The Arkansas Supreme Court strikes down the state's execution law, calling the form of lethal injection the state uses unconstitutional.
August 7, 2012 - The Supreme Court allows the execution of Marvin Wilson, 54, a Texas inmate with low IQ.
November 6, 2012 - A measure to repeal the death penalty in California fails.
May 2, 2013 - Maryland's governor signs a bill repealing the death penalty. The legislation goes into effect October 1.
June 26, 2013 - Texas executes its 500th prisoner since 1982, Kimberly McCarthy, for the 1997 murder of Dorothy Booth. McCarthy is the first female executed in the U.S. since 2010.
November 20, 2013 - Missouri executes white supremacist serial killer Joseph Paul Franklin for the 1977 murder of Gerald Gordon. He was blamed for 22 killings between 1977 and 1980.