Others have described him as a reckless risk taker who has been in trouble before, such as a boating accident in 2009 which put him into a hospital intensive care unit.
But in a report on Sunday, a South African man who said Steenkamp had stayed at his home since September, described Pistorius as moody and impatient. Cecil Myers, whose daughter was close friends with Steenkamp, said in an interview in the City Press newspaper, that Pistorius will have the killing of Steenkamp on his conscience. "I hope he gets a long sentence. Gets what he deserves," said Myers.
Pistorius appeared "very nice and charming to us when they started dating," said Myers. Myers said Pistorius initially used to come into the house but later just dropped Steenkamp off and picked her up when they began to date steadily, and he described the change as a lack of respect.
Myers recalled their first date and told the newspaper: "After that he wouldn't leave her alone. He kept pestering her, phoning and phoning and phoning her."
According to Myers, Steenkamp "told me he pushed her a bit into a corner. She felt caged in."
Myers said he told Pistorius "not to force himself on her. Back off." He said that after initially agreeing with him, it appeared that Pistorius soon took no heed.
Myers declined to respond to a request for more information from Associated Press.
In the bail hearing, a character reference for Pistorius, acknowledged that "the only issue in the relationship that I was made aware of was that Reeva sometimes thought Oscar was moving a little fast."
Pistorius was born without fibula bones due to a congenital defect and his legs were amputated when he was 11 months old. He has run on carbon-fiber blades and was originally banned from competing against able-bodied peers because many argued that his blades gave him an unfair advantage. He was later cleared to compete. He is a multiple Paralympic medalist, and won a silver medal at the 2011 Daegu world championships with South Africa's 4x400 relay team. But he failed to win a medal at the London Olympics, where he ran in the 400 meter race and the 4x400 relay race.
AP Sports Writers Gerald Imray contributed from Centurion and John Leicester from Johannesburg. AP Writers Christopher Torchia and Andrew Meldrum contributed from Johannesburg.