Why are England, NZ players wearing black armbands in their T20 WC semi-final?

England and New Zealand players are wearing black armbands in their T20 World Cup semi-final match in Abu Dhabi. This is in tribute to Mohan Singh, chief curator of Sheikh Zayed Stadium, who passed away ahead of New Zealand-Afghanistan match on November 7. England and New Zealand players also observed a minute’s silence ahead of semi-final in memory of Mohan.