The partnership's last public collapse came in Las Vegas in December 1956, only weeks after Costello had been celebrated on Ralph Edwards's This Is Your Life. By then, Abbott's health and timing had deteriorated noticeably; he had suffered from epilepsy since approximately 1926 and had also battled alcohol abuse, reportedly connected to his attempts to stave off seizures. During the Las Vegas engagement, Abbott's missed cues disrupted Costello's carefully timed responses and left the act visibly embarrassed. Accounts differ over the precise incident: one version says Costello had to lead a drunk Abbott offstage, while other witnesses describe the breakdown more cautiously. What is consistent is that the routine failed badly, and the duo split in 1957. Costello died in 1959, while Abbott briefly tried a new act with Candy Candido before admitting that nobody could replace Lou.
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