BROOKLYN - Detectives investigating the murder of an 8-year-old Brooklyn boy are now looking into whether the suspect in the crime has ever had improper contact with children.

The Brooklyn District Attorney's Office is examining three computers seized from the home of 35-year-old Levi Aron, who has been charged with murdering and dismembering Leiby Kletzky.

During his arraignment yesterday, Aron pleaded not guilty to the charges.

Meanwhile, police say they've found scratches on Aron's arms and wrists, possibly indicating that the 8-year-old victim may have fought for his life before he was suffocated with a towel.