Simplify the following text for a Grade 8 native English-speaking person.
Original: She continued to work for the welfare of the Pakistani people until she died in Karachi on July 8 , 1967 , there is also a conspiracy that she was murdered by Dictator Muhammad Ayub Khan 's agents .
Simplified: She continued to work for the welfare of the Pakistani people until she died in Karachi on July 8 , 1967 .