Cassie Hayes dies after attack at Tui branch in Southport
A 28-year-old woman died after being attacked at the travel agents where she worked.
Cassie Hayes died of her injuries in hospital after the incident at the TUI store in Chapel Street, Southport.
A man aged 30 from St Helens has been arrested on suspicion of murder, Merseyside Police said.
Police described the incident, at about 13:25 GMT on Saturday, as "domestic-related". Ten police vehicles and two air ambulances attended the scene.
A force spokesman said: "The woman was taken to hospital where she subsequently died from her injuries.
"The woman's next of kin have been informed."
A TUI spokeswoman said: "We regret to confirm that a female member of staff at our Southport TUI retail store tragically died in an incident today.
"We send our deepest sympathies to the friends and family of the staff member involved.
"We're doing everything possible to assist the local police with their investigation and support our customers and staff at this difficult time."