A post-mortem examination is due to be carried out on the body of TV presenter Mark Speight.

The 42-year-old was found hanging in a building next to Paddington train station on Sunday.

Police are trying to find out how he managed to access the partially-disused office block and are examining CCTV footage from the station last Monday when Mr Speight was last seen alive.

Friends said he was left reeling by the death of his fiancee Natasha Collins at the flat they shared in St John's Wood, north-west London, in January.

In the weeks after the tragedy, Mr Speight moved in with her mother, Carmen, who reported him missing last Monday after he failed to keep an appointment with her.

Paying tribute to the presenter, she said: "We were devastated to lose Natasha earlier this year and for Mark to have now died as well is tragic."

She added: "We are very sad and cannot believe what has happened. Mark was a deeply special person, his loving nature and kind heart made such a difference to our lives.

"In the past three-and-a-half months since Natasha died we as a family have grown closer to Mark.

"We can see why Natasha loved him so much as we grew to love him even more.

"His vivacious personality touched the lives of many and we were privileged to have known him. Our thoughts are with Mark's family at this sad time."

A coroner recorded a verdict of death by misadventure at the inquest into Miss Collins' death.

She had taken cocaine and sleeping tablets and suffered hot water burns covering 60 per cent of her body.

Mr Speight was initially arrested on suspicion of murder and supplying class A drugs but no charges were brought.

British Transport Police (BTP) said railway workers found his body on the roof of MacMillan House at around 10am on Sunday.

According to company records, the office block is used as a base by several railway and bus transport firms.

A BTP spokeswoman said the body was in "a remote area out of public view" of the building, which is close to platform one of the station.

The post-mortem will discover how Mr Speight died and identify how long his body lay undiscovered.

© Independent Television News Limited 2008. All rights reserved.