Prosecutors announced Thursday that they were dropping all charges against Guandique, who was given a new trial last year after doubts were raised about a key witness at his 2010 trial. The U.S. Attorney's Office for the District of Columbia issued a statement saying the murder case against Guandique could no longer be proved beyond a reasonable doubt "based on recent unforeseen developments that were investigated over the past week." "After investigating this information and reviewing all of the evidence in this case, the government now believes it is in the interests of justice for the court to dismiss the case," prosecutors wrote in a one-page motion. "[...] the government has had to concede the flaws in its ill-gotten conviction," the lawyers said, noting that Guandique had passed an FBI-administered lie detector test regarding his involvement. [...] Guandique was granted a new trial last year after doubts were raised about a jailhouse informant, Armando Morales, who was the key witness at Guandique's trial. In May, defense lawyers sought to take depositions from several women who said they had sexual relationships with Condit.