(CNN) Mary Duggar, the grandmother of the 19 Duggar children of TLC's "Counting On," died of an accidental drowning after she fell into a pool at her home in Arkansas on Sunday.

She was 78.

Duggar slipped and fell into the pool and drowned, Washington County coroner Roger Morris told CNN. Her daughter Deanna discovered her body and alerted authorities, who pronounced her dead at the scene.

Morris said Duggar experienced a "few health issues" before her death.

The family shared the news of her passing on their official Facebook page