Sky News Australia | Cheng family 'heartbroken' by dad's death Sky News Australia Investigations are continuing into what motivated a Sydney teenager to carry out a terror-related shooting that left one NSW police worker dead. Curtis Cheng, 58, was killed in Friday's attack, which police believe was politically motivated and linked ... Teenager attended Islamist group lecture before murder Cheng family 'heartbroken' by dad's shooting death Police check mosque, bookstore links after Sydney police shooting |