The following text is for question no. 7 to 9 

Zookeeper Died After Tiger Attack 

     A female zoo officer m South Lakes Wild Zoo, England was killed by a Sumatran tiger in front of visitors. The woman suffered a tiger attack on her head and neck. South lakes wild zoo is a popular zoo in England with a complete collection and good security for visitors. The tragedy occurred under the zoo’s surveillance.
    Visitors were hysterical at the rapid attack. Some officers attempted to help the woman but she was already helpless and needed intensive care due to terrible injuries.  After receiving treatment the woman opened   her eyes, but then died. The major  cause of her death was a heart attack and the injuries  from the Sumatran tiger. 
    The zoo owner,  David Gill said, “She worked here for several years and she understood the  behavior of wild animals and the security procedure to get into the cage.”  He added, “But I don't know what was on her mind that moment. Somehow she  the ignored safety procedures.” 
    Arriving at the crime scene , the police collected witnesses for questions.  Until the time this news was released,  the driver remains unknown.  Willy Suharto son's,  was distraught with what happened to his father and Sarinah, coming  a few moments later,  cried over her dead husband.  
 

What caused the woman's death?