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. Beattie died in 1920.
A L Holt died in 1971.
A. L. Freehafer died in 1940.
A. L. Westgard died in 1921.
A. L. Morton died in 1987.
L. A. Ring died in 1933.
A. L. Erlanger died in 1930.
I. L. Peretz died in 1915.