László was born in 1922. László's father was Técsy Géza and his mother was Karkecz Julianna. His paternal grandparents were Técsi József and Bartha Vilma. He had a brother named Géza. He was the younger of the two children. He died from a stroke at the age of 61 in 1983 in Szeged. The funeral took place in Szeged. He was buried in Szeged.