A mother today told of her heartbreak at the death of her daughter who was injected with a fatal fix of heroin by her drug addict boyfriend.

Shortly before receiving the overdose, Tracey Bradley had penned an emotional letter to her parents which arrived the day after she died.

Wiping away tears, after her daughter's boyfriend Jason Caswell was yesterday jailed for four-and-a-half years, Irene Bradley recalled: "The letter said 'I am trying really hard mum.

"I have reduced my methadone (a heroin substitute) dose to ten milligrams a day. I am going to come down and stay with you and get myself sorted out.'"

Instead, the 28-year-old overdosed, collapsed and died after Caswell injected her in the arm with a syringe of heroin at their flat at Wensleydale House, Keighley.

Caswell, 29, was convicted of manslaughter on a majority verdict at Bradford Crown Court after jury members heard how he had prepared the fix because Tracey was 'moody' and he wanted to keep her quiet.

Mrs Bradley, 51, said: "About ten days before her death, Tracey said she was coming down to stay with us in Poole where we live.

"We said we would pick her up but she said 'Don't worry, I've got money I'll get the train'".

The distraught mum said: "If Tracey had come, she would be here today."

Bradford Crown Court heard how Tracey had desperately been trying to kick her habit and piece her life together so that she could regain custody of her seven year old son, John.

"I feel sure if she had got away from Caswell and away from the area she would have found the right track again," said Mrs Bradley.

Despite coming from an affluent and respectable family, Tracey first took crack cocaine when she was 21 while living in Lanzarote. She had met a boyfriend and after they had an argument, his friends encouraged her to smoke the highly-addictive drug.

Two months later she discovered she was pregnant and flew back to England.

"She wanted to make sure the baby was okay so she left that whole scene behind and gave birth to a beautiful boy."

But later, after her boyfriend flew across after her, Miss Bradley began smoking the drug again.

"She knew she was on the wrong track and went back to Spain and voluntarily went into rehab."

After the successful treatment, Miss Bradley even appeared on Spanish television to warn youngsters about the dangers of drugs.

"Then she was like my old Tracey. She put on weight and was full of bounce again. She was kind-hearted and happy-go-lucky - the most mischievous monkey that was ever born."

Mrs Bradley said her daughter 'stayed clean' until, after returning to her native West Yorkshire, she met Caswell two years ago.

Since then, her drug taking spiralled out of control until her tragic death.

Mrs Bradley said: "I asked her why she stayed with him. She said 'I was able to kick the habit and I thought I could help him but I can't'".

"She had been such a perfect child. When she was born she melted everybody's heart - then, when she got older she broke everyone's heart.

"She didn't like alcohol - she wouldn't even have wine with a meal.

"Her son often cries when he is with me. Tracey was very much like me and I think he senses that."

As a youngster, Miss Bradley had been an excellent pupil and Girl Guide. She played classical guitar, practised ballet and in her spare time took part in Duke of Edinburgh Awards schemes and life-saving training.

Mrs Bradley said: "It can happen to anyone. You can come from a slum council estate or live in a mansion - heroin will destroy your life."

"I will never, ever forgive him for taking my daughter away from me."