U.S. first lady Michelle Obama (R) lays a wreath with Antoinette Sithole, sister of Hector Pietersen, at the Hector Pietersen Memorial in Soweto, June 22, 2011. Hector Pietersen became a symbol of the apartheid struggle in South Africa when he was killed by police during the 1976 student uprising in Soweto . REUTERS/Siphiwe Sibeko (SOUTH AFRICA – Tags: POLITICS)