Children’s TV presenter Mark Speight said today he was "absolutely distraught" at the death of his fiancee, Natasha Collins.

Wolverhampton-born Speight, who has been bailed by police on suspicion of murder and supplying class A drugs, said he is assisting them with their inquiries and had nothing to do with Collins’ death.

She was found in the bathroom yesterday at the home they shared in St John’s Wood, north west London.The BBC presenter discovered the body, a spokeswoman for Speight said. Police said a suspected drug overdose was one line of inquiry they were considering.

The tragedy comes just days after the suspected drug-related death of former Radio 1 breakfast DJ Kevin Greening.

Speight’s spokeswoman said: "Mark has been questioned by the police on account of the fact that the body of his fiancee, Natasha Collins, was found in the flat they shared. At the moment no-one knows what happened. Mark found her body in the bathroom and immediately called an ambulance and the police.

"The police are conducting further inquiries and a post-mortem is under way. Mark was the only other person present in the flat and has therefore been questioned by police as a matter of course.

"He is assisting police with their inquiries and had nothing to do with Natasha’s death. Mark is absolutely distraught at the loss of Natasha and hopes that everyone will appreciate what a very sad time this is for both Mark and Natasha’s family."

A Scotland Yard spokesman said the death was being treated as unexplained.

The 42-year-old Speight has worked on numerous shows for the BBC, CITV and the Discovery Channel. He is best known for presenting the children's programme SMart.

He shot to fame as the rubber-faced presenter of Children’s ITV Saturday morning show Scratchy & Co.

Collins starred alongside him on BBC children’s show See It Saw It. She was represented by the HandE casting agency, based in Epping, Essex.

Today the company paid tribute to her, saying: "Natasha had a fantastic personality and has been called back to reappear on advert and model campaigns/jobs many times.

"We are shocked and devastated that Natasha has passed away and we offer our support and condolences to her family and friends. She was a wonderful, confident young lady and her beauty was inside and out.

"Although she was a client of HandE’s, Natasha was also classed as a friend and will be genuinely missed."

The BBC has cancelled tomorrow’s scheduled 10am showing of SMart.

The show is currently being repeated on CBBC. A decision has yet to be made on whether next week’s episodes will be screened, a BBC spokeswoman said.

A new series of SMart is not scheduled until the end of the year.