By MyFM's Rick Michaels - A Blackstone man is being held without bail after entering a not-guilty plea at his arraignment in Worcester Superior Court yesterday on a murder charge in the death of his father. 49-year old Glen Armstrong was also committed to a hospital for 60-days of psychiatric observation. His father, 83-year old Walter Armstrong, was found dead in the home they shared on Summer Street in Blackstone following a well-being check. A medical examiner saying the father was suffocated with a bag. Glen Armstrong took his father's pick-up truck and left the state. He was arrested a short time later in New Jersey where he fought extradition back to Massachusetts. Once back in the Bay State, Armstrong was held without bail until his indictment last week.