A Skerton West councillor has resigned from Lancaster City Council.
Labour councillor Karen Leytham has left after more than 10 years on the council.
A former member of the council cabinet, Mrs Leytham was first elected to represent the Skerton West ward at a by-election in December 2006 and was re-elected at subsequent city council elections.
The vacancy in the Skerton West ward will be filled by a by-election on a date to be announced.
Coun Leytham said she had resigned for personal reasons.