Oscar Pistorius, 27, shot Reeva Steenkamp, 29, at his home in Pretoria on February 14, 2013.
State prosecutors allege the killing was premeditated, but the Paralympic champion claims he mistook her for an intruder.
For the first time in South Africa, parts of the trial will be televised live. Media interest is high.
The arrest of the national sporting hero astounded South Africa.
Double amputee Oscar Pistorius won gold at the London 2012 Paralympic Games and also competed at the Olympics.
Oscar Pistorius’s uncle, brother and sister are also in court; next to them on the relatives’ bench is the family of Reeva Steenkamp, including her mother June.
Gerrie Nel, who is leading the prosecution team, will be the key figure in Monday’s proceedings, as he begins to lay out the state’s case against the athlete.
State prosecutors say Oscar Pistorius planned the killing and shot Reeva Steenkamp after a row.
If found guilty of premeditated murder, the sportsman could face life imprisonment.
Oscar Pistorius has also been charged with illegally possessing ammunition.
_bMwPzWHQaMPresident Joe Biden has urged pro-Palestinian protesters on university campuses to uphold the rule of…
Blue Ivy Carter has joined the voice cast of The Lion King prequel Mufasa: The…
At least five people, including a four-month-old baby, have been killed after dozens of tornadoes…
Harvey Weinstein has been hospitalized just days after his 2020 rape conviction in New York…
Hamas has published a video showing the first proof of life of US and Israeli…
Prosecutors and Donald Trump’s attorneys delivered opening statements and the first witness was called on…