Fast food chain McDonald’s announced Jerome Krulewitch, corporate executive vice president, general counsel and secretary, has retired from his role immediately following his being diagnosed with Parkinson’s disease.

Krulewitch was advised by his doctors to step down, McDonald’s noted in a regulatory filing last Thursday.

Krulewitch has been with McDonald’s for 18 years, getting his start as vice president - litigation in 2002, according to his LinkedIn profile. He was named to his EVP and general counsel role in March 2017.

A search is underway for Krulewitch’s successor, McDonald’s disclosed. Mahrukh Hussain, who was serving as U.S. general counsel, will take on the role of interim general counsel and secretary in the meantime.