To obtain a Legal Heir Certificate in Kerala, a Voter ID card is not a mandatory document. Essential requirements include the Aadhaar Card of all concerned individuals, an affidavit from the legal heirs, and testimonies from two neighbourhood witnesses. While not strictly required, a Voter ID can be useful as it confirms Indian nationality, which may be relevant in some cases. Other supporting documents like Ration Cards or Family Pension Payment Orders can also be submitted.