The former boyfriend of a 21-year-old Flushing woman was arrested yesterday and charged in the stabbing deaths of the woman, Ms Sharon Ng, and her 18-year-old brother, Simon, on May 12 night, the police said. The suspect, Jin Cheng Lin, 23, of 59-12 155th Street in Flushing, was charged with first-degree murder, burglary, and weapons counts. The police said they found Mr. Lin's name in Ms. Ng's diary and in a computer entry made by Mr. Ng that day. (Source: Michael Wilson, The New York Times, May 17, 2005).