Indira gandhi was assassinated by a member of her bodyguard because

She had been accussed of corruption

of a religious conflict

Explanation:

Indira Gandhi was the prime minister of India. She was killed by her 'Sikh Bodyguards' Satwant Singh and Beant Singh. It is believed to have happened because of the so called Operation Blue Star, which was a military action that was meant to remove the militant religious leader Jarnail Singh Bhindranwale and his many followers from the buildings of the Harmandir Sahib (the Golden Temple). It seems this resulted in the death of many Sikh, which caused a raising sentiment of rage and injustice int he community.