Hi Andy
WAC isn't on the "heroes" list. This just means that he didn't receive any notable medals etc.
However, he is on the "Jersey Roll of Honour". Corporal Walter Andrew Cheney, born St Helier and serving in the 3rd RMIJ (Royal Irish Rifles), died 7th Feb 1915. There are no other details in that record.
There is a Walter Cheney in the St Helier death index, Feb 1914 to Feb 1916, volume 48, page 49. Do you have the certificate? I can go and have a look at it to see how he died.
There are also records of the Roll of Honour kept at the Archive which I can look at.
Stewart