The last pictures of grief-stricken TV star Mark Speight caught on Tube station CCTV

He was caught on CCTV entering Queen's Park tube station in north London on Monday, still tormented by the drugs death of his fiancée Natasha Collins, 31, three months ago.

He had found her lying in a scalding bath after he woke from a drugs and booze binge the couple had indulged in.

The CCTV image shows Mr Speight apparently patting his pockets as if he was looking for something before going to board a Bakerloo line train.

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Missing: These images of Mark Speight were captured on CCTV at Queen's Park Tube station at 2.25pm on Monday, April 7

Moments before, he withdrew money out of an ATM near the station.

Fears have been growing for Speight who has not been in touch with his family since Monday morning.

About an hour earlier on the day Speight was last seen, two police officers had seen him in Kilburn, north London, behaving oddly.

They offered to call him a doctor or simply someone to talk to but he hurried off.

He had then arranged a meeting at a Covent Garden coffee shop with Miss Collins's mother Carmen, 57.

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He had been staying with her family in Palmers Green, north London.

It is known that he boarded a train in the direction of Covent Garden but did not turn up.

His mobile phone has been switched off and is untraceable, said police.

And it remains a mystery as to what happened after Speight stepped on the Tube.

A family friend said: "We have no idea what happened.

"It seems Mark had every intention of making the meeting with Carmen.

"When he left home that morning there was nothing to suggest anything was wrong. He was comparatively upbeat."

The search has now spread nationwide to places he enjoyed visiting with Miss Collins.

The officer leading the hunt, Detective Inspector Declan Williams, said: "They used to visit places outside London like the Thames Valley area, the Cotswolds and places in Dorset.

"We are contacting local forces to check them out."

Last week, Westminster Coroner Dr Paul Knapman recorded a verdict of death by misadventure on Miss Collins who had a "very significant" amount of cocaine in her system.

Mr Speight, 42, told police the couple had been "partying" at home in St John's Wood where they had taken cocaine and sleeping pills as well as drinking wine and vodka.

Friends say he has been unable to come to terms with Miss Collins's death and suffered terrible bouts of guilt.

In February, he resigned from his job as presenter of BBC children's programme SMart unable to work because of his grief.

Cocaine binge: Speight's fiancée Natasha Collins was found badly burned in a scalding bath