Five Dacorum police officers will be among charity walkers taking on a challenge to illuminate the summit of the Lake District Peaks.
Light the Lakes - on Saturday, April 28 - is in memory of murdered Surrey police officer Heather Cooper, 33.
Since her body was discovered in Blackdown Forest, Sussex, last October the Surrey Police Federation has set up a trust fund for her two young children.
The Dacorum police team is made up of Sergeant Richard Ballinger, PC Curtis Banks, PC Stephen Hunneysett, PC Dean Sanderson and a fifth officer who cannot be identified because of the nature of his work.
To sponsor the walkers email Rich.Ballinger@Herts.pnn.police.uk or donate directly at www.facebook.com/LightTheLakes