Looks as if William Cassidy died on a Friday and the Derry Journal's next issue was the following Monday. Too late for death notice but I found a write up of William in Wednesday's issue of the D.J.
Derry Journal: Wednesday 15th February, 1928 P.8
Death of Esteemed Derry Man.
Great sorrow and regret were occasioned not only in Derry City, but throughout the North West by the death of Mr William Cassidy, Rossville Street, who was one of the best known cattle dealers in the North of Ireland. Deceased was highly esteemed by all who enjoyed the pleasure of his acquaintance and was noted for the strict probity with which he conducted his business. His word was everywhere his bond. Mr Cassidy came of old and respected Derry family and was a life long Nationalist, and a pious and practical Catholic. During his last illness, which he contracted only a fortnight ago, he was attended by Rev. J. Bonner C.C. St. Eugene's. May he rest in peace. There was a very large and representative attendance at the funeral which took place on Sunday. Amongst those present were the Rev. J. L. McGettigan, Adm., and Rev. J. Bonner, the latter officiating at the graveside. The chief mourners were, Michael, John, William, Denis, Francis (sons) James Carr, Ballinlost, Donegal. James Cassidy, Thomas Cassidy, Denis Cassidy, James Cassidy, Patrick Cassidy, Michael, Bob and James Lecky (nephews) John Carr, Ballinlost, Donegal (brother in-law) William, Patrick, Denis, Kevin, Michael, Thomas, William and Jack Cassidy (grandsons.)
The funeral arrangements were satisfactorily carried out by Messrs J. L. McClafferty & Sons, Wellington Street.