I think 'successful' needs to be defined here.
If you mean 'successful' as in 'and got away with it', we will never know the names as they got away with it.
Or do you mean successful as in 'rich' or 'full of success'?
Alaa Kaakarli.
Paul Hanna
Draco Malfoy
diesies
russel andrei p.pucan
Tons of leader killed prisoners: Hilter was the most famous one i think
Tom Hanks and Harrison Ford
Stephenie Meyer because of how big her books have gotten.
Someone wouldn't really be the most famous person but she is successful.
He killed God and stole his powers.
more successful, most successful
Often times the police will ask the person to testify in court about the murder, so in a way they might squeal on him. Most places have websites or phone numbers you can use to tell and still remain anonymous.