A man was spotted hanging from the window ledge of his top-floor flat moments before falling to his death on Saturday.
He is believed to have been trying to fix a faulty window shortly before the tragic accident at around 8.30am in Pelham Court, Leverstock Green.
The man, who lived alone, had asked a neighbour for help with the work about 30 minutes before police were called by concerned tenants.
One shocked householder, who asked not to be named, said: “Everybody is feeling ill from what happened. He was just a lovely bloke.”
He said that the victim, aged in his early 50s and named locally as David Vibert, had finished redecorating his ninth-floor flat the night before.
Tenants of the block, owned by Dacorum Borough Council, say they have complained numerous times about seals hanging off the windows, allowing in drafts and rainwater.
They say they have also complained about safety latches that unhook without warning, causing windows to open much further than expected.
Council spokesman Sara Hamilton offered condolences to the victim’s family and said the council was working with police to learn more about the circumstances of the incident.
She said: “First and foremost our condolences go out to the deceased’s family and friends.
“As a reassurance to our residents, council officers and a surveyor are visiting the Pelham Court flats today (Monday).
“We will not comment further until the circumstances are fully understood.”
Police have confirmed they are not treating the death as suspicious.