What is jack welker?

Jack Welker is a fictional character in the television series Breaking Bad, portrayed by actor Michael Bowen. He is a member of a white supremacist group and is hired by Todd Alquist to assist in a series of methamphetamine heists. Welker is shown to be a violent and brutal sociopath, willing to kill anyone who gets in his way. He serves as a major antagonist in the second half of the series, ultimately meeting his demise at the hands of Walter White in the series finale.