(CNN) -- Here is some background information about domestic (intimate partner) violence.
According to the Centers for Disease Control and Prevention, intimate partner violence includes victimization by current and former spouses or current and former dating partners. Violence can include physical, sexual, emotional, and economic abuse, according to the Office on Violence Against Women.
Worldwide: Thirty-five percent of women worldwide have experienced either physical and/or sexual intimate partner violence or non-partner sexual violence, according to a 2013 United Nations global review of available data.
One out of every three women has experienced intimate partner abuse during her lifetime, according to the American Psychology Association.
United States: Each minute - Twenty-four people are victims of intimate partner violence, according to the Centers for Disease Control and Prevention.
Each day - Three or more women are murdered by their boyfriends or husbands on average, according to the American Psychology Association.
Each month - The National Domestic Violence Hotline receives an average of 22,000 calls.
Each year - Over 12 million women and men are victims of intimate partner violence, according to the Centers for Disease Control and Prevention.
U.S. deaths 1980-2008 (from the Department of Justice, Bureau of Justice Statistics) Overall - Almost one out of five or 16.3% of murder victims were killed by an intimate partner.
Women - Women account for two out of three murder victims killed by an intimate partner. The number of women killed by an intimate partner fell from 43% in 1980 to 38% in 1995, but rose to 45% in 2008.
Men - The number of men killed by an intimate partner fell from 10.4% in 1980 to 4.98% in 2008.
Timeline: June 19, 1990 - S. 2754, the Violence Against Women Act (VAWA) is introduced in Congress by Senator Joseph Biden, but it is not enacted.
June 1991 - The American Medical Association publishes recommendations that physicians routinely inquire about possible abuse.
January 21, 1993 - Biden re-introduces the bill.
September 13, 1994 - President Bill Clinton signs the Violence Against Women Act into law within the Violent Crime Control and Law Enforcement Act. It must be renewed every five years. The law also establishes the Violence Against Women Policy Office and the Violence Against Women Grants Office (now the Department of Justice Office of Violence Against Women.)
February 21, 1996 - The National Domestic Violence Hotline gets its first calls, and gets 4,826 calls its first month.
1999 - The Office of Violence Against Women is created by a merger of the Violence Against Women Policy Office and the Violence Against Women Grants Office.
October 28, 2000 - The Violence Against Women Act of 2000 is reauthorized with new provisions and signed into law by President Bill Clinton. The new provisions include the Trafficking Victims Protection Act and expanded measures for battered immigrant women.
August 2, 2003 - The hotline receives its millionth call.
January 5, 2006 - The Violence Against Women and Department of Justice Reauthorization Act of 2005 is signed into law by President George W. Bush, with new provisions on dating violence, Native American women and the use of DNA fingerprinting.
April 28, 2009 - The hotline receives its two millionth call.
April 26, 2012 - The Senate votes on S.1925 to reauthorize VAWA with expanded measures to include battered illegal immigrant women, Native American women and the LGBT community.
May 16, 2012 - The House votes on H.R. 4970 to reauthorize VAWA. The House version omits the expanded measures of the Senate bill.
December 31, 2012 - For the first time since it was enacted, VAWA expires. VAWA, which must be renewed every five years, is not reauthorized by Congress.
March 7, 2013 - S.47, the Violence Against Women Reauthorization Act of 2013 is signed into law by President Barack Obama with new provisions. The new provisions address the needs of illegal immigrant women, Native American women, the LGTB community and teen dating violence and they reauthorize the Trafficking Victims Protection Act.
July 2013 - The hotline receives its three millionth call.