The defence lawyer of a crown witness in a major gangland investigation was shot dead in the Amsterdam district of Buitenveldert on Wednesday morning, police say. Derk Wiersum was representing Nabil B, a key witness in the case against gangland boss Ridouan Taghi. Taghi is said to be behind a string of killings in Utrecht and Amsterdam in the ongoing the ongoing ‘mocro mafia’ drugs wars. Source DutchNews