Harvey Atkin, who voiced Sam in the Sam & Max animated series, passed away on July 18th. Atkin was the second of three voice actors who have so far taken on the role of Purcell's character, though he is more widely known for his roles on TV shows such as Cagney and Lacey and Law and Order, as well as the Ivan Reitman comedy Meatballs, which he co-starred in opposite Bill Murray.
Thanks to "Threepwood4life" for bringing this to our attention in the comments.Source: The Hollywood Reporter