Matthew James Cassidy, 19, from Merseyside, died at Bethel Place in Connah's Quay on Monday.
North Wales Police have now arrested an 18-year-old man in Merseyside on suspicion of murder and he is being questioned by officers in St Asaph.
A 48-year-old man arrested on the same charge on Monday remains in custody.
Mr Cassidy's family said they were left "completely and utterly devastated" by his death.
A man in his 40s and two women, aged 19 and 60, who were arrested on Tuesday on suspicion of assisting an offender, have all been released without charge.
A second murder suspect has been arrested by police investigating the fatal stabbing of a man in Flintshire.