According to numerous sources, author Donald Westlake died on New Year’s Eve in Mexico of an apparent heart attack on his way to dinner. He was 75.

Over the course of his career, Westlake had written more than 90 books, employing a number of pen-names, arguably the most famous of which was “Richard Stark,” under which he wrote the Parker series of novels.

Westlake was working with acclaimed comics creator Darwyn Cooke on graphic novel adaptations of the first four Parker novels for IDW Publishing, The Hunter (aka Point Blank), The Man with the Getaway Face, The Outfit, and The Mourner.

Westlake is survived by his wife, four sons from previous marriages, three stepchildren and four grandchildren.