A second witness, neighbor Estelle Van Der Merwe, also told the court today that she heard a woman's voice in what sounded like an argument. Van Der Merwe testified that she heard four "thuds" and then complete silence the night Steenkamp died.
The day concluded with the third witness, Charl Johnson, who is Burger's husband, being called to the stand. While Burger said she heard one shot followed by a pause and then three successive shots, her husband told the court he was not sure how many shots he heard.
Johnson will resume his testimony on Wednesday, when he is expected to face an aggressive cross-examination by Roux.
Pistorius, 27, who faces a premeditated murder charge and several weapons counts, has pleaded not guilty. The Olympian said he mistook his girlfriend, model Reeva Steenkamp, for an intruder and shot her through a bathroom door.
If he is convicted, Pistorius could face at least 25 years in prison before he is eligible for parole.