A man stabbed to death at his home in Heswall has been named as retired detective inspector Andrew McDiarmid.
The 64-year-old was discovered when officers were called to a property on Oldfield Way at around 20.45 on Monday night.
Mr McDiarmid was pronounced dead at the scene at his next of kin have been informed,
A 21 year-old man arrested at the scene on suspicion or murder has now been detained under the Mental Health Act and taken to hospital for assessment.
A 54-year-old woman has been released on bail as enquiries continue.
Mr McDiarmid was a former Merseyside Police officer who retired as a detective inspector in intelligence in 2008 after 30 years’ service.
A post mortem has been carried out and the cause of death has been confirmed as stab wounds.
An investigation remains ongoing and officers remain on Oldfield Way while extensive CCTV, house-to-house and forensic enquiries being carried out.
Chief Constable Serena Kennedy said: “Andy joined Merseyside Police in 1978 and spent 30 years with the service, working at Wavertree police station and in CID in Tuebrook, Huyton and Wirral.
“Our thoughts and condolences are with Andy’s family at this tragic time.”