Jeff Conaway, 'Kernickie'
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'Grease': Then And Now
10. Jeff Conaway, 'Kernickie'
Conaway was married twice - the first time to Olivia Newton-John's younger sister Rona. He married his second wife, Kerri Young, in 1990, but they later separated. After spending some time in and out of rehab, Conaway passed away in 2011 of complications from pneumonia at age 60.