The heartbroken animal was first heard crying while lying in the earth at the burial plot in Central Java, Indonesia.
Passer-by Keli Keningau Prayitno, 28, tried to adopt the cat but it returned to the same spot - nuzzling the small blue headstone.
Father-of-one Keli said: 'Since the cat's mother died she has stayed here at the grave. She does not want to go home. She has been here for almost a year.
'I thought she was homeless and tried to help but every time she would keep returning to the same place.
'I saw her everyday and noticed that she was always there, but sometimes would leave for a couple of hours then come back.
'I followed her and she was going to the home where she used to live and the lady's children would feed her.
'Then the cat would go back again to the same place. She sleeps there and meows.
'It's very sad to see. It shows just how close animals are to their owners..'
Keli said he had followed the cat and discovered the former owner had been an old lady called Kundari who had recently died.
Despite being offered new homes, even a year later the cat can still be seen at the grave night and day.