RIP Regis. Somewhat on topic: Dana Carvey is running out of living people to impersonate.
Andy Rooney (d. 2011)
Casey Kasem (d. 2014)
Mickey Rooney (d. 2014)
John McLaughlin (d. 2016)
George Michael (d. 2016)
Garry Shandling (d. 2016)
Abe Vigoda (d. 2016)
George H. W. Bush (d. 2018)
Robin Leach (d. 2018)
Ross Perot (d. 2019)
Kirk Douglas (d. 2020)
Regis Philbin (d. 2020)
I'd worry about Paul McCartney, but Dana Carvey has also impersonated Dick Cheney and Keith Richards, both of whom will live forever.