Entertainer and Las Vegas resident Phyllis McGuire has died LENNOX MCLENDN/Associated Press Singer Phyllis McGuire, 64, the youngest of The McGuire Sisters, plays a harp at her home in Las Vegas, Tuesday, Dec. 12, l995. McGuire says she is very upset over stark portrayal of her in the HBO movie special, "Sugartime," which focuses on Ms. McGuire's on-again, off-again romance with mobster Sam Giancana, beginning in 1959 when she and sisters Dorothy and Christine were one of the hottest acts in show business. (AP Photo/Lennox McLendon) and last updated 2020-12-31 16:24:51-05 LAS VEGAS (KTNV) â The remaining member of The McGuire Sisters has died.