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Oscar Pistorius On The Stand: #AskNBCNews Your Trial Questions

Image: Pistorius leaves after attending his trial at the high court in Pretoria
Oscar Pistorius leaves after attending his trial at the high court in Pretoria April 7, 2014. South African Olympic and Paralympic track star Pistorius took the witness stand in his own defence at his murder trial on Monday, saying the shooting of his girlfriend Reeva Steenkamp had left him sleepless, terrified and plagued by nightmares. REUTERS/Siphiwe Sibeko (SOUTH AFRICA - Tags: SPORT CRIME LAW ATHLETICS)SIPHIWE SIBEKO / Reuters

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Oscar Pistorius broke down and sobbed uncontrollably Tuesday as he testified at his murder trial of the moment he realized he had killed girlfriend Reeva Steenkamp. In perhaps one of the most emotional days of the trial, the South African track star said he feared there was an intruder inside the bathroom ready to "attack me or us."

"I was afraid ... someone was going to start shooting," he added. "I heard a noise from inside the toilet. Before I knew it, I'd fired four shots at the door. There was ringing in my ears.”

What did we learn from Pistorius' testimony? How might it impact the remainder of the trial? And what is the reaction in South Africa?

Join NBC News for a live, interactive discussion at 1:30 p.m. ET on Tuesday to discuss all of that and to answer your questions. Hosted by Rehema Ellis, insights will be offered by Jeff Rossen and Mike Taibbi in South Africa.

Viewers can submit questions using the hashtag #AskNBCNews on Twitter and Facebook. Bookmark this link to watch live. The video will also be available on-demand later this afternoon.

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