Reeva Steenkamp and Oscar Pistorius
Gallo Images/REX USA
02/14/2013 AT 01:00 PM EST
02/14/2013 AT 09:00 AM EST
Hours before her tragic death
, Oscar Pistorius's girlfriend, Reeva Steenkamp, was clearly excited for Valentine's Day, posting several messages about the "day of love" on Twitter.
"What do you have up your sleeve for your love tomorrow???" she wrote in one post. In another, replying to a friend, she added: "It should be a day of love for everyone."
Steenkamp, 30, whom authorities believe was shot to death by Pistorius, 26 – though the details of the alleged murder remain unclear – also posted a photo Wednesday of a shake that the Paralympic champion had gotten her.
"It's a beautiful day! Make things happen," she wrote.
A celebrated figure in her own right in South Africa, Steenkamp was a well-known model, a law-school graduate and a reality TV star.
She was named one of FHM
's "100 Sexiest Women in the World" for two years in a row. She is also one of the celebrity contestants on the upcoming season of the reality show Tropika Island of Treasure
, which is due to premiere in South Africa this Saturday.
Steenkamp was also known as a women's activist. She was due to give a talk about women's empowerment on Thursday at a Johannesburg school, and also spoke out for women's rights through social media.
This past Sunday, she posted an illustration of domestic violence on Instagram
and wrote: "I woke up in a happy safe home this morning. Not everyone did. Speak out against the rape of individuals in SA."
As friends react with shock to the news of her death, Steenkamp's publicist, Sarit Tomlinson, said in a statement, "Our thoughts and prayers go to the Steenkamp family, who have asked to have their privacy respected during this difficult time. Everyone is simply devastated. She was the kindest, sweetest human being; an angel on earth and will be sorely missed."