5 Things to Know This Morning

April 17, 2013— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. Sanford's Ex-Wife Says He Trespassed
Former Gov. Mark Sanford's campaign for a vacant South Carolina congressional seat hit another bump Tuesday as court documents surfaced revealing his ex-wife Jenny Sanford filed a court complaint against the former governor in February for trespassing at her home.

2. Dignitaries Attend Thatcher's Funeral
Britain's Margaret Thatcher was laid to rest this morning in a ceremonial funeral with military honors that stretched from the Houses of Parliament to St. Paul's Cathedral. Queen Elizabeth and her husband, Prince Phillip.

3. Senator Receives Potential Ricin Letter
Police have a suspect in mind as they try to determine who mailed a letter to Sen. Roger Wicker that tested positive for ricin.

4. Boston Marathon Breakthrough With Recovery of Bomb Remains
Federal agents zero in on how the Boston Marathon bombing was carried out with a kitchen pressure cooker packed with explosives, nails and other lethal shrapnel. Authorities say they still have no leads on who might have done this or why.

5. 'DWTS' Says Goodbye to Another Star
After five weeks of struggle on the ballroom dance floor, comedian D.L. Hughley was voted off ABC's "Dancing With the Stars" Tuesday night.