If you mean Alyson Court, then so far as I've searched or known, no. She's still alive. =D
Alison Plowden died in 2007.
Alison Smithson died in 1993.
Alison Rehfisch died in 1975.
Walter Alison Edwards died in 1924.
Walter Alison Phillips died in 1950.
Francis Alison died in 1779.
Alison Parrott died in 1986.
Michael Alison died in 2004.
Charlie Alison died in 1952.
Roberta Alison died in 2009.
Alison Cockburn died in 1794.
Alison Plowden died in 2007.
Alison Smithson died in 1993.
Alison Rehfisch died in 1975.
Alison Stephens died in 2010.
Its not Alison that died..Its her mental twin sister,Courtney
Alison Begbie died in 1823-06.