Witness thought screams were a junkie At first Joshua Rathmell thought the noise he heard as he was walking to work through Hyde Park was the "deranged" screams of "a junkie on an ice bender." And Mr Rathmell initially thought the shirtless man he saw on the 15th floor of an apartment block was throwing black luggage off a balcony. But after talking to some nearby tradesmen, he realised what had hit the ground on Liverpool Street was a body, a murder trial heard on Thursday. Mr Rathmell was on Thursday morning giving evidence at the trial for the murder of 30-year-old Lisa Harnum in the NSW Supreme Court. Her former fiance Simon Gittany, 40, has been accused of throwing her off the balcony on July 30, 2011. He has pleaded not guilty to the charge. Under examination from the crown, Mr Rathmell told the court what he had witnessed. He said his attention was drawn to the apartment in The Hyde building after hearing "deranged" screams while walking to the ABC's Ultimo office, where he worked as an editor, at about 9.55am. "The noise was not unlike guttural noises I have heard in the past from junkies," Mr Rathmell told the court. Looking up at the balcony, he saw a shirtless man holding what he thought was luggage in his arms, he told the court. "I saw a man carrying ... black luggage or a black object," he told the court. The man then "unloaded" the object and went back inside the apartment. He did not see the object hit the ground as his view was impeded by cars and busses on Liverpool Street. But he went to see what had happened and told the court a group of people were trying to resuscitate what appeared to be a body. He told the court he then saw a man, who he believed to be the same person he'd seen on the balcony, exit the building. The man observed what was going on from a distance, before moving to speak to the group trying to assist the person on the ground, Mr Rathmell said. Mr Rathmell continued on his way to work where he later called police to report what he'd seen. Mr Rathmell will be cross examined by defence lawyers on Thursday afternoon.