Actor Isiah Whitlock Jr, who played the role of state senator Clay Davis on 'The Wire', passed away at the age of 71. Isiah was known for his catchphrase 'sheeeeee-it', an elongated pronunciation of the word 's**t'. Whitlock passed away in New York after a short illness, according to his manager. He also featured in 'Veep' and 'Goodfellas'.