He's long been known as a hit with older men.
He is known as a serial killer.
This new product will be a market killer.
seducer; tempter
Colloquial use for a person who is very attractive and seductive, often with a nuance of being dangerously charming. Can be used for both men and women.
She is a seductress who leads men astray.
キラー (killer) and カラー (color) are both katakana loanwords with a similar ー-lengthened sound, but they have completely unrelated meanings.
Borrowed from English 'killer'.
ladykiller who targets married women; handsome young man popular with married women