UnScramble this Word: o a l t c e o c h?

Questions

who was the lead singer with the undertones?

who provided the voice of the evil spirit 'captain howard' in the exorcist?

which rapper starred as a cop in the film 'new jack city'?

which actors original name was 'william henry pratt'?

which tv presenter used to be the girl in the boddingtons beer commercials?