As well as being one of the driving forces behind the Fisherman's Friend brand, Doreen also supported many good causes and community projects in Fleetwood, donating millions of pounds through the years.
Tributes have poured into today following the news. You can read some of the many messages here.
Here are just some of many pictures from our archives over the last 30 years.
5.
Doreen Lofthouse (left) of Fishermans Friend in the Snoezelen (corr) Room at Fleetwood Hospital with Ward Manager Louise Noblett.
6.
Doreen Lofthouse officially opened the £3 million YMCA Lofthouse Building on Dock Street in Fleetwood.
8.
Doreen Lofthouse being made an OBE by the Prince of Wales at Buckingham Palace in 2008.
2 / 4