A former BSI banker currently facing six charges relating to the ongoing probe into Malaysia’s beleaguered state investment fund, 1Malaysia Development Berhad (1MDB), is now facing a further charge of forgery, according to Singaporean prosecutors. Yeo allegedly and fraudulently signed a reference letter sent to the anti-money laundering branch of Citibank to facilitate a transfer of US$11.95 million from SRC International (Malaysia) -…