(Portland, OR)  --  Authorities say a man who was stabbed to death on a MAX train last Friday did nothing to provoke the attack.  Police say 51-year-old Michael Brady was sitting across the isle from the suspect, Shondel Larkin.  Surveillance video from the train shows Larkin suddenly stand up and start to stab Brady.  Larkin was arrested and charged with murder.  Nora Brady released a statement saying she wants people to know her husband was a great human being, a loving father of a six-year-old boy, and a loving husband.