In Pretoria, South Africa where the defense team of Olympic sprinter Oscar Pistorius questioned the credibility and reliability of a prosecution witness on the second day of the athlete's high-profile murder trial. Witness Michelle Burger was cross-examined by defense lawyers Tuesday, a day after testifying that she heard screams, followed by gunshots, then more screams in the early hours of February 14, 2013. Burger lives less than 200 meters from Pistorius' Pretoria home. Pistorius has admitted to shooting model Reeva Steenkamp, but said he mistakenly believed he was firing at an intruder. Prosecutors say Pistorius killed Steenkamp after an argument. VOA's Ndimyake Mwakalyelye gets an update from VOA's Anita Powell in South Africa.