<sod >Ms McSpadden, whose 18-year-old son was shot and killed by police while he was unarmed on 9 August, has rarely participated in protests.< eod>< sod > Ms McSpadden, whose 18-year-old son was shot and killed by police while he was unarmed on 9 August, has rarely participated in protests, but she took a prominent place in Saturday's events, which were part of a weekend of planned demonstrations.< eod>