The 30-year-old Maseko hit a million other competitors to win an Ax Apollo Space Academy-sponsored space travel that was untimed at the time of his death.
"Then I went to the spacecamp and thought I might actually be an astronaut."
Maseko was named one of 23 winners of the competition worldwide in 2014 shortly after the death of South Africa's first black president, Nelson Mandela.
In 2016, he was honored by the South African Gauteng Department of Education and had, according to Au ssage a science building at a school named after him.
Details of his memorial service and funeral will be announced later this week, said the spokeswoman for the family, Sthembile Shabangu hashtag #RIPMandlaMaseko.
He spent eight days aboard the International Space Station in 2002.