Peterr asked for English ghost ballads : here are two for starters.
The Unquiet Grave ( child Number 78) - all versions I know have 'the ghost did rise to speak' to his true love who was mourning on his grave for 12 months and a day.
'Flame of Fire' - although not a Child Ballad was collected by Cecil Sharp from Mrs Betsy Pike in Somerton, Somerset in 1906. It has a musrdered lover coming back to haunt and kill her sailor murderer.