BY SCOTT SHENK Date published: 7/7/2011 BY SCOTT SHENK Sky Express bus driver Kin Yiu Cheung pleaded not guilty yesterday to four counts of involuntary manslaughter as his wife watched. Through a translator, Qun Lin said she and her husband feel awful for those killed and injured in the crash. "It's sad, but it's an accident," Lin said through interpreter Steven Xing. "His life was on the line also." Lin drove the couple's two young children from New York to see Cheung, but they weren't allowed in the courtroom. She plans to take their 5-year-old son and 7-year-old daughter to visit Cheung at the Pamunkey Regional Jail in Hanover today. Lin saw her husband appear before the judge after a Caroline County grand jury indicted Cheung on the involuntary manslaughter charges stemming from the May 31 Sky Express bus crash on Interstate 95. Four women died in the crash and 53 were injured. http://fredericksburg.com/News/FLS/2011/072011/07072011/637723