In February 2012, 17-year-old Trayvon Martin was shot dead by a member of a Neighbourhood Watch group who claimed he was acting suspiciously. The unarmed black teenager was returning to a gated community in Florida after buying some snacks from a nearby convenience store His death sparked national outrage in the US over racial profiling and the first use of the slogan "Black Lives Matter". Rachel Naylor talks to Trayvon Martin's high school friend, Ashley Burch.

PHOTO: A protest demanding justice for Trayvon Martin in 2013 (Getty Images)