During his time writing for Parks and Rec, which wraps Feb. 24 on NBC, Wittels also had a recurring bit part as one of two "pothead" animal control workers. The other was played by comedian Colton Dunn. The show finished filming in December.
"Today, I lost a friend. I lost a dear, young friend in my life who was struggling with addiction," Poehler said.
"I'm sharing it with you because life and death live so close together, and we walk that fine line everyday," she added. "When things happen in our lives, we turn to the people that we love ... and we lean on people, in a hope that we will ease our pain."