LONDON, ENGLAND - MARCH 27:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge talk to Stephen Lawrence's mother Baroness Doreen Lawrence (R) as they leave the Stephen Lawrence Centre in Deptford on March 27, 2015 in London, England. The centre is built in memory of 19 years old Stephen Lawrence, who was stabbed to death by a group of white youths in April 1993 as he was waiting for a bus. (Photo by Alastair Grant - WPA Pool/Getty Images)