The au pair at the center of the Brendan Banfield aggravated murder trial finished a grueling day of cross examination late Wednesday, and at times she grew visibly frustrated with the line of questioning. 25-year-old Juliana Peres Magalhães repeatedly told Banfield’s defense attorney that she could not remember key moments in the planning and lead up to the murders. Thursday’s testimony began with detectives describing the bloody aftermath of the master bedroom, as jurors took in photos and descriptions of the murder weapons, bloodied clothing and crime scene.