This is unknown.
Leif Rustad died in 1976.
Leif Panduro died on January 16, 1977, in Asserbo, Denmark.
Leif Henie died on August 13, 1984, in Alameda, California, USA.
She OD'd on toast.
Leif Petterson died on July 30, 2008, in Toronto, Ontario, Canada of heart attack.
Leif Eriksson was killed in battle
Leif Hallberg died in 1960.
Leif Vetlesen died in 2003.
Leif Thybo died in 2001.
Leif Schiller died in 2007.
Leif Sörvik died in 1963.
Leif Haugen died in 2001.
Leif Næss died in 1973.
Leif Husebye died in 2009.
Leif Granli died in 1988.
Leif Christensen died in 1988.
Leif Iversen died in 1989.