Trials are due to begin on a treatment for cystic fibrosis which replaces a faulty gene and stops mucus forming in the lungs.
Toni Hannon is from Ripon and her son Evan has the condition. When he's ill he coughs, has night sweats and panic attacks, vomits and is always tired.
She's raised money in the past for research into the illness.
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Tuesday morning weather: Bright spells. Mainly dry.
Weather tonight: Showery outbreaks of rain.
The victim, a Leeds woman aged in her fifties, was walking her animal along Bootham in York on Friday evening at around 8pm.