The sexual assault trial of a Lower Sackville man got underway this morning in Bridgewater Supreme Court. John Leonard MacKean is facing two charges involving a chained-up teenage boy in a cabin in Upper Chelsea in 2012. The 64 year old is also charged with communicating for the purpose of obtaining sexual services from a person under 18. Crown prosecutor Lloyd Tancock says three witnesses will be called over the coarse of the trial. The young boy is expected to be one of the witnesses. A 12 member jury, consisting of 7 women and 5 men, was selected yesterday. Defence lawyer Mike Taylor will represent the accused. The high profile case is expected to last about three days.