Hyder, who had suffered from a cancerous growth on his back, died in his camp on 6 December 1782.
Some other accounts record it as 7 December 1782 and some historical accounts in the Persian language record the death in dates ranging from Hijri 1 Moharram 1197 to Hijri 4 Moharram 1197 in the Islamic calendar.
The differences in recorded dates may be due to the lunar calendar and the differences in moon sightings in the surrounding kingdoms.

Hyder's advisers tried to keep his death a secret until Tipu could be recalled from the Malabar coast.
Upon learning of his father's death Tipu immediately returned to Chittoor to assume the reins of power.
His accession was not without problems: he had to put down an attempt by an uncle to place Tipu's brother Abdul Karim on the throne.
 The British learned of his death within 48 hours of its occurrence, but the dilatory attitude of Coote's replacement, James Stuart, meant that they were unable to capitalise on it militarily.

Hyder Ali was buried at the Gumbaz in Seringapatam, the mausoleum raised by his son Tipu Sultan in 1782–84.
Hyder, who had suffered from a cancerous growth on his back, died in his camp on 6 December 1782. Some other accounts record it as 7 December 1782 and some historical accounts in the Persian language record the death in dates ranging from Hijri 1 Moharram 1197 to Hijri 4 Moharram 1197 in the Islamic calendar. The differences in recorded dates may be due to the lunar calendar and the differences in moon sightings in the surrounding kingdoms.
Hyder's advisers tried to keep his death a secret until Tipu could be recalled from the Malabar coast. Upon learning of his father's death Tipu immediately returned to Chittoor to assume the reins of power. His accession was not without problems: he had to put down an attempt by an uncle to place Tipu's brother Abdul Karim on the throne.  The British learned of his death within 48 hours of its occurrence, but the dilatory attitude of Coote's replacement, James Stuart, meant that they were unable to capitalise on it militarily.
Hyder Ali was buried at the Gumbaz in Seringapatam, the mausoleum raised by his son Tipu Sultan in 1782–84.
Hyder Ali