Volume 1, page 242: "Having been captured in Shropshire by the Queen's party, he [Edmund (Fitz Alan), Earl of Arundel] was, without trial, beheaded at Hereford, 17 Nov. 1326, in his 42nd year."
"His body was initially buried in the Franciscan church at Hereford, but later reburied at Haughmond Abbey, Shropshire, at the request of the abbot and convent [Victoria County History, Shropshire, vol.2, p.64, quoting the text of Corpus Christi College, Cambridge, MS 339, f.46 (continuation of the chronicle of Peter of Ickham)]. Provision was also made for 6 candles to burn around his tomb at Haughmond [Una Rees, ed., The Cartulary of Haughmond Abbey, p.227 (1985); this entry is dated 1 March 1325/6, before Edmund's execution]."
p. Richard FITZ ALAN (03 Feb 1267 - 09 Mar 1302) and Alasia DE SALUZZO (c.1270 - 25 Sep 1292)
m. 1305 Alice DE WARREN (c. 1287 - 23 May 1338) Issue. they had four sons and six daughters. 
Katherine (abt. 1305-1318 - May 1376)
Richard "Cropped Hat" 10th Earl of Arundel and 9th Earl of Surrye (c. 1307 - 24 Jan 1375)
Fitz Alan / de Arundel: Richardson notes for Edmund's father (footnote 25, p 599): "Earl Richard Fitz Alan above, his father and grandfather all employed the surname Fitz Alan. In the 1270's, Earl Richard's father was styled John "Fitz Alan de Arundel" in several records [see C.P.R. 1272-1281 (1901): 11, 96, 161, 331]. In 1291 Earl Richard received a grant addressed to him as "Richard de Arundel, Earl of Arundel" [see C.P. 1 (1910): 241].... Following the Earl Richard's death in 1302, the family dropped the surname Fitz Alan in favor of de Arundel (or simply Arundel ). The last known use of the name Fitz Alan by any member of this family dates c.1312–3, when Earl Richard's son, Edmund, brought a writ as "Edmund Fitz Alan [see Year Books of Edward III 12 (Rolls Ser. 31b) (1905): 518–521]. . . ."
Royal Ancestry by Douglas Richardson Vol. II. page 603
↑Magna Carta Ancestry: A Study in Colonial and Medieval Families, vol II, page 178
↑ Douglas Richardson, Magna Carta Ancestry, 2nd Edition, Vol. I, p. 157-158.
↑ Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families, 5 vols., ed. Kimball G. Everingham (Salt Lake City, Utah: the author, 2013), Vol II, pp 599-607 ARUNDEL #9, #10. Edmund de Arundel (or Fitz Alan), Knt.
It may be possible to confirm family relationships with Edmund by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: