The circumstances surrounding the death of Greater Manchester Police chief constable Michael Todd are to be investigated by another force.
Sir Paul Scott-Lee, chief constable of West Midlands Police, will be looking at whether Mr Todd's personal life had adversely impacted on his duties.
Mr Todd, a married father-of-three, was found dead on Snowdon, north Wales.
An inquest heard Mr Todd had more than the legal drink-drive limit of alcohol in his blood when he died.
Her Majesty's Inspectorate of Constabulary announced the inquiry by Sir Paul.
Carolyn Todd paid tribute to her husband
It said in a statement: "An independent rigorous inquiry into the circumstances surrounding Michael Todd's tragic death is currently being handled on behalf of the coroner by North Wales Police.
"HM Inspectorate are in liaison with that constabulary and are monitoring developments closely."
It said acting chief constable Dave Whatton and the chairman of Greater Manchester Police Authority had asked Sir Paul Scott-Lee to conduct an examination of the circumstances "to ensure that nothing in the conduct of Mr Todd's personal life had adversely impacted on the professional discharge of his duties as chief constable".
Mr Todd, 50, was found dead on Tuesday after being reported missing while out walking.
He lived in a flat in Manchester during the week and returned to his wife Carolyn, twin boys aged 13 and 16-year-old daughter in Nottinghamshire at weekends.
Book of condolence
Mrs Todd paid tribute to a "loving father and husband", saying she and her children were struggling to come to terms with his death.
In a statement, she said: "I loved Michael very much and the last time I spoke to him he told me he loved me too."
She later agreed to the release of pictures of herself and appealed for the media to leave her and her family to grieve in private.
Manchester's Chamber of Commerce said it supported its boss Angie Robinson, following reports that she had been having an affair with Mr Todd.
Meanwhile mountain rescuers have been working to find a waterproof jacket that belonged to Mr Todd, which he would have been wearing on Snowdon.
The Llanberis mountain rescue team has been reviewing weather forecasts and wind directions to pinpoint where it might have blown.
Books of condolence have been opened at Manchester Cathedral and online at the Greater Manchester Police website.