South African Paralympic athlete Oscar Pistorius has been arrested over the fatal shooting of his girlfriend Reeva Steenkamp at his home, local media say.
Police said they have charged a 26-year-old man with murder, but did not confirm it was Mr Pistorius.
The precise circumstances surrounding the incident are unclear. Reports say he may have mistaken her for a burglar.
Mr Pistorius, 26, is known as the "blade runner", and was the first double amputee to run in the Olympics.
The suspect is expected to appear at Pretoria Magistrates' Court later on Thursday, police said.
They also confirmed that a woman had been shot dead at the home of Oscar Pistorius and that she was a friend of the athlete.
Police added that there had been previous incidents at the address and described them as "allegations of a domestic nature".
Reeva Steenkamp's publicist confirmed to the BBC that the 30-year-old model had died.
"Everyone who knew her is in tears. She was an absolute angel, the sweetest, sweetest human being, a kind human being," Sarit Tomlinson said.
The news that Mr Pistorius may have killed his girlfriend will shock the country as the athlete is regarded as one of South Africa's national icons, reports the BBC's Peter Biles from Cape Town
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