Police and federal authorities have been searching extensively for Irwin who was 10 months old when her parents reported her missing on Oct. 4
Oct. 5, 2011: An undated family photo of Lisa Irwin is shown at a news conference in Kansas City, Mo.
This image, provided by Fox affiliate WDAF-TV, shows 10-month-old Lisa Irwin.
Oct. 6: Searching near the family's home, members of the Kansas City Police Department, FBI and other law enforcement agencies gather and search in a heavily wooded area for clues in the disappearance of missing infant Lisa Irwin.
Oct. 7: Deborah Bradley, left, and Jeremy Irwin embrace while in the lobby of an Hampton Inn hotel in Kansas City, Mo. Bradley said in an interview Friday that she took a polygraph earlier this week after her baby, Lisa Irwin, disappeared from their Kansas City home. Bradley says police told her she failed the test. Lisa's father, Jeremy Irwin, said he has offered to take a lie detector test, but police said he did not have to.
Oct. 7: This photo from video provided by KSHB-TV in Kansas City, shows authorities searching the Deffenbaugh Industries Johnson County landfill in Shawnee, Kan.
Oct. 7: Leaflets were handed out for people to distribute after the prayer vigil in honor of missing infant Lisa Irwin on at Penguin Park in Kansas City.
Oct. 7: Katie Smith,12, of Shawnee, fights tears during the prayer vigil in honor of missing infant Lisa Irwin at Penguin Park in Kansas City.
Oct. 4: Kansas City Missouri Fire Department Rescue Technicians used repelling equipment as they search a wooded area for missing 10-month-old Lisa Irwin in Kansas City, Mo.
Lisa Irwin was reported missing on Oct. 4 after her father, Jeremy Irwin, said he returned home from work to find the lights on, a window tampered with, the front door unlocked and his daughter gone.