And often it is the person who allows them or gives them a stronghold in their life.
Note that in these last days, satan is permitted to physically kill , through many different agencies including guns, knives, ama pharmacy, poisons, pollution, heart attacks, etc etc etc
and martyrdom, satan is given permission to kill the saints in Revelation.
also he kills through deception...
And the serpent said unto the woman, Ye shall not surely die: For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil.
(Gen 3:4-5)
And Jesus answered and said unto them, Take heed that no man deceive you. For many shall come in my name, saying, I am Christ; and shall deceive many.
(Mat 24:4-5)
And many false prophets shall rise, and shall deceive many.
(Mat 24:11)
For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
(Mat 24:24)
But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
(2Pe 2:1)
Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
(1Ti 4:1)