Frank Chen was a prominent and wealthy businessman. He was also the father of Amanda Chen, and an old friend of the Queen family. He had very close ties to The Undertaking, and was influential in its success. Frank was killed by Malcolm Merlyn, aka The Dark Archer, after being revealed but also framed by Moira as sole conspirator rather then a co-conspirator, for the assassination attempt on Malcolm's life.
Frank Chen has had a long history with Chien Na Wei and her organization of assassins.