Intresting Aptitude Question Answer It if You Can

SOLVE THIS CASE :
A man was found murdered on 26/1/1992 afternoon.
His wife called police and they questioned everyone.
1) Wife : I was sleeping when the murder took place.
2) Cook : I was cooking
3) Gardener : I was picking vegetables.
4) House maid : I went to postoffice.
5) Children : we went to play.
6) Neighbour : We went for a marriage
Police arrested the murderer immediately.
Who`s it & why?
Its a kingfisher Airlines Aptitude Test


Answer will be shortly posted.