Shaheed (Martyr)

Q: Is it permissible or obligatory to kill a person that comes to attack you for your wealth or any of your possessions and you try to protect your wealth? 

What is the preferred option?

Q: Is the blood of a martyr (shaheed) pure and paak?

Q:

1. My parents passed away when I was a minor. My mother was shot when I was 2 years old and my father was shot when I was 6 years old. Does that make both of them shaheed?

2. I'm unaware of any qadha salaahs or fast if they had any. I was told that my father used to cover up qadha salaahs, I'm not sure if he completed it. What must I do on behalf of them? I would have estimated how many salaahs and fasts they had from the age of their puberty till demise and paid for every salaah and fast but I'm not a wealthy person. I dont know if I should give kafaarah on their behalf for any qadha salaah and fasts and how much I need to pay for them both as I am unaware of the amount of qadha salaahs or fasts for them both. What must I do?

Q: I have heard from someone that if one passes away because of cancer, they pass away as a Shaheed (that is they gain martyrdom). They also have said that if one passes away from the corona virus and any other such virus then they also pass away as a Shaheed. Is there any truth to these statements?

Q: Is it correct that if a person passes away due to a stomach illness, he becomes a shaheed.

Q: A person died of a heart attack. Is this regarded as a good death or a bad death?

Q: I have heard that the person who dies while blood comes out of his mouth dies the darjah of a shaheed (martyr). Is this true?

Q: My father has recently been murdered unjustly and brutally due to vengence or money (cause not clear as yet). He raised 4 daughters and was a retired army officer. Is he shaheed?

Q: If a person is murdered (and gains martyrdom) then can ghusal be given to his body? In many cases, post mortem is conducted by non-muslim doctors and najaasat could have come onto the body. Also, it is possible that ghusal could have been waajib on the deceased at the time of his death. Will these factors affect the mas'alah in any way?

Q: If a Muslim is robbed and murdered innocently, and dies on the spot, is he a shaheed-e-dunyawi? In our country in this time and age, which situations would be classified as shaheed-e-dunyawi?