Man dies after his mother-in-law`s gravestone falls on him

London: A 74-year-old man was killed in Pennsylvania after his mother-in-law'sgravestone collapsed on top of him during the cemetery visit.

Police officials revealed thatStephen Woytack was kneeling next to the grave marker when the top portion toppled on to his head and killed him, Sky News reported.

Woytack had been helping his wife tie a cross around the stone at St Joseph's Cemetery in Throop on when the incident occurred.

The cemetery 's caretaker, Ed Kubilus, said that some headstones become unstable this time of year as the ground begins to thaw, which causes the bases to sink slightly.