Keith Davies, the Labour Assembly Member for Llanelli, is seriously ill at the University Hospital of Wales in Cardiff.
Mr Davies, who's 71, was elected to the assembly after a career as a teacher and subsequently as Director of Education at Carmarthenshire County Council.
More top news
Andrea Byrne presents the first episode of the new series Helimeds which follows the Welsh flying medics.
Variable cloud and clear spells overnight with isolated showers mainly in the north.
Becoming drier and brighter from the northwest during the day, but with the risk of scattered, locally heavy, showers developing later.