Leonid Kulik died on 1942-04-24.
Leonid Kulik was born on 1883-08-19.
Yes, Leonid Kulik is a noun, a propernoun, the name of a person (noted Russian scientist). A proper noun is always capitalized.
Ivan Kulik died in 1937.
Johann Kulik died in 1872.
Vasiliy Kulik died in 1988.
Jakob Philipp Kulik died in 1863.
Grigory Kulik died on 1950-08-24.
Yuri Kulik died on September 1, 2013.
Valentin Kulik died on March 15, 2005, in Moscow, Russia.
Buzz Kulik died on January 13, 1999, in Los Angeles, California, USA of heart failure.
Leonid Sandalov died in 1987.
Leonid Sherwood died in 1954.