He died and did not perform Hajj because he was negligent – can someone perform Hajj on his behalf?

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Check below answers in case you are looking for other related questions:
Changing one’s mind after thinking of going on Hajj or ‘Umrah
Etiquette of travelling to Hajj and elsewhere

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Related Answers:
‘Umrah is mustahabb at any time in Ramadaan
Does a husband have to take his wife for Hajj?
Performing Another ‘Umrah While in Makkah
Changing one’s mind after thinking of going on Hajj or ‘Umrah
Etiquette of travelling to Hajj and elsewhere

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