Ivan Cheung, 42, is accused of raping two young girls and two women in separate incidents in 2003, 2005 and 2006. He worked for State Street, a financial services firm in Boston. The young girls, aged 13 and 14, were Cheung’s first victims in 2003, according to prosecutors. He allegedly picked up the 13-year-old girl, who was a sex worker, in Chinatown, drove her somewhere else, raped her at knifepoint and ultimately stabbed her in the shoulder. Cheung allegedly did the same to a 14-year-old ...