As I was invited to another man's wedding

Man goes to a wedding where his true love is supposed to marry another man. He sings her a song asking how she can marry someone else. She begs her husband to let her sleep alone that night, and the next morning he finds her dead.Mercer, p. 162; Laws P31; Greenleaf, 1968: 155; Karpeles, 1934: 134; Karpeles, 1971: 124; Peacock, 1965: 691, 693, 695, 697 (The Green Willow; The Green Willow Tree; The Wedding). [see also: The Green Willow (Tree); The Faultless Bride; The Love Token; The Wedding Supper; The False Lover.] 64-16, C126, Codroy Valley; 68-40, C521, St. John's; 68-40, C538, Conche, WB; 70-8, C690, Arnold's Cove, PB; 72-195, C1349, Jerseyside (?), PB; 78-6, C3319, St. John's; 78-236, C3546A, Freshwater, Pb; 79-1, C3839, Freshwater, PB; 79-002, C3695, Arnold's Cove, PB. Laws ABBB P31 "The Nobleman's Wedding" 1957: 264; Purslow "Marrow Bones" 1965: 61-62; Fowke "Green Willow" 1979: 41; Belden "Ballads and Songs", "The Faultless Bride" 1966: 165-166; Mercer 1979: 162; Huntington, et al. "Sam Henry's Sgons of the People", "An Old Lover's Wedding" and "The Laird's Wedding" pp. 263-266 (also lists further sources)