If you are talking about L in Death Note, yes he died (killed of a heart attack. not by light, but by rem :C ). If you are not, then I will get back to when you tell me what you are talking about >_< .
L. L. Langstroth died in 1895.
L. L. Nunn died in 1925.
L. L. Clover died on 1975-05-03.
L. L. Marshall died on 1958-01-12.
A. L. Erlanger died in 1930.
A. L. Barker died in 2002.
A. L. Hendriks died in 1992.
L. Gundappa died in 1986.
I. L. Peretz died in 1915.
A. L. A. Himmelwright died in 1936.
L. Swart died in 1909.
A. L. Moore died in 1939.