The parents of a 26-year-old man stabbed in Nottingham as he tried to help a woman who was being assaulted have praised their son's actions.
Ian, a Derby University graduate was on a night out with old university friends
Ian Montgomery from Reading, Berkshire was stabbed in the Goose Gate area of Hockley, near to Browns bar in the early hours of Sunday.
He is in a critical but stable condition at Nottingham's Queen's Medical Centre.
A Nottingham man, 20, was arrested on Sunday and later released on bail.
Mr Montgomery, a graduate of Derby University was on a night out in Nottingham with former university friends.
His father Stephen Montgomery, 54, said his family were devastated at what had happened.
He said: "I just can't believe that something like this would happen.
"I'm proud he tried to stop something. I don't think anybody could walk past seeing a lady get hit and not say something. But you don't expect a reaction like this."
His mother Marian, 53, added: "Ian would always go to help.
"It's just in his nature, he's been brought up a good boy.
"Things like this should not be going on. He's tried to do his best to help this poor young girl and some coward has knifed him for it."
The 20-year-old woman who was being attacked suffered injuries but did not require treatment.
Mr and Mrs Montgomery have appealed for anyone who has any information on the incident to contact police.