A PRINCIPAL of a primary school yesterday appeared for a second time in San Po Kong Court in connection with the murder of an accounts clerk. Wong Sai-ming, 51, is alleged to have murdered Lau Yung-mui in the Good Shepherd Primary School, Ma Tau Wai Road, Hunghom, on July 13. No plea was taken and Magistrate Anthony To adjourned the case until August 13 pending legal advice. He ordered Wong to be remanded in jail custody. Wong last appeared in San Po Kong Court on July 16 when the case was adjourned pending an identity parade and further inquiries.