Oscar Pistorius' prison sentence has been increased to 13 years and five months by South Africa's Supreme Court of Appeal.
Pistorius explained that he had not fired a warning shot as he thought he might be harmed if the bullet ricocheted.
The former Paralympian was initially sentenced to five years in prison for culpable homicide by a High Court judge in 2014, but only served 10 months of the sentence before being released and put under house arrest.
The former Olympic and Paralympic sprinter killed Steenkamp at his home in an upscale Pretoria neighborhood on Valentine's Day 2013 - an act he says was an accident after he mistook her for an intruder.
At the same time, Steenkamp's parents have sent their love to Jayde Panayiatou's parents after her husband, Chris, was sentenced to life in prison for her murder.
Oscar Pistorius' jail term increased to 13 years
However, prosecutors on the case called the sentencing "shockingly lenient" and appealed the decision. The court agreed and the sentence is now 13 years.
"I find it hard on the evidence to accept that the respondent is genuinely remorseful", Seriti wrote in his decision.
Pistorius has to serve at least half of his new sentence before he is considered for parole. (He) failed to take the court fully into his confidence. "To my mind, the attempt by the respondent to apologize to the deceased's family does not demonstrate any genuine remorse on his part".
The ruling added that Pistorius "displays a lack of remorse and does not appreciate the gravity of his actions".
Big developments in South Africa this morning.. He tried to make contact before and during the trial.
"I did not expect the Supreme Court of Appeal to hand down such a lengthy sentence of imprisonment", legal analyst Ulrich Roux said on the eNCA news channel.
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