A 52 years old patient who never saw a dentist in last 10 years came for an examination and possible treatment. You find generalized loss of attachment and deep pockets. Tooth 1.6 had more than 8 mm of pocket depths. Patient reported that he had sensitivity and later prolonged pain on having cold water. You performed the Thermal Tests and there was no response on 1.6. What would be your diagnosis for the pulpal status of that tooth?

Pulpal Necrosis

Acute Suppurative Pulpitis

Irreversible Pulpitis

Reversible Pulpitis