viṣa-ādi khāñā - by drinking poison; haridāsa - Junior Haridāsa; ātma-ghāta kaila - has committed suicide; sei pāpe - on account of that sinful activity; jāni - we understand; brahma-rākṣasa - a brāhmaṇa ghost; haila - he has become.

“Haridāsa must have committed suicide by drinking poison, and because of this sinful act, he has now become a brāhmaṇa ghost.