She was an American actress best known for her portrayal of the voice of recurring unseen character Mrs. Wolowitz on the television series The Big Bang Theory. Susi was born in Brooklyn and was of Italian descent. She studied acting at HB Studio in New York City before moving to Los Angeles in the 1970s. Kolchak: The Night Stalker (1974) was her first screen appearance. Susi also had extensive experience in live theater and voiced a character on the video game installment of CSI: NY. On November 11, 2014, she died of cancer, aged 62.