Really sad to hear this. I remember watching him many years ago in a sit com called 'Rosie' about a young police officer called PC Penrose, which was set in Yorkshire. Paul Greenwood played Rosie and Tony Haygarth his sidekick.
Of course Tony Haygarth went on to do so much more in the way of fine acting roles, he really was a talented and versatile actor.
Sadly, it seems he had been suffering from Alzheimer's disease for the last few years.