In her original Hunger Games, Johanna pretended to be a weakling, feigning hunger and fatigue, when in reality she was sly and cunning, described by Katniss as having a "wicked ability to murder". Johanna is proficient with axes, as she comes from District 7, where the main industry is lumber. It is hinted in Catching Fire that all of Johanna's loved ones were killed by President Snow and the Capitol after her Games, as she tells Katniss that there is "no one left [she] loves." This is then confirmed in Mockingjay by Finnick Odair.
THE HUNGER GAMES: CATCHING FIRE hits theaters November 22, 2013 with Jennifer Lawrence, Josh Hutcherson, Liam Hemsworth, Lenny Kravitz, Elizabeth Banks, Stanley Tucci, Donald Sutherland, Toby Jones and Woody Harrelson reprising their roles.
Source: The Hollywood Reporter