A man who was stabbed in St Helens town centre on Sunday died in the early hours of this morning.
He has been named locally as Ryan Lamb.
A post-mortem will be carried out and his family have been informed.
An 18-year-old man from Kensington who was arrested on suspicion of attempted murder was bailed last night pending further enquiries.
A 21-year-old man from Huyton who was arrested on suspicion of assault remains in custody for questioning by detectives.