Determine if the sentence is true based on the text below:
Vernon Deloss Walker in his spare time was very into martial arts, particularly Brazilian Jiu Jitsu.

Vernon Deloss Walker (August 14, 1931 April 19, 1996) was a notable advertising executive and political campaign consultant. Walker founded the Memphis, Tennessee-based advertising firm Walker + Associates, Inc. in October 1965. Walker played a major role in politics, corporate marketing and philanthropy throughout the South from the 1960s to 1990s.
It's impossible to say