JOHANNESBURG (Reuters) - South Africa's Investec, Nedbank and Sanlam said on Thursday they had exposure to a failing building supply company First Strut, whose chairman was shot dead in June. Trade in First Strut's 925 million rand worth of bonds was suspended last week following an application to place the firm in liquidation, according to a stock exchange filing. Its chairman, Jeff Wiggill, was found dead with a bullet wound to his head next to a luxury Bentley automobile in the early hours of June 20 in the Soweto township that borders Johannesburg. His wallet and cell phone were missing. ...

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