Coroners in Leeds are appealing for any relatives of 79-year-old Tony Mann to get in contact.
Mr Mann died on Christmas Eve (December 24) at his home address on Dyers Court in Hyde Park.
He died of natural causes.
Mr Mann possibly had a sister called Cybil although no further details are known about her.
Any relatives of Mr Mann are asked to contact Coroners Officer Clive Firth on 0113 3970603.