Harris Wittels, a comedian and co-executive producer of Parks and Recreation, has died at the age of 30.

Wittels was found in his L.A. home on Thursday. While the official cause of death is not yet known, the Los Angeles Police Department tells EW it appears to have been an overdose.

A bright stand-up and writer, Wittels penned many key Parks episodes, including “94 Meetings,” “Road Trip,” “The Treaty,” and “Filibuster,” as well as the second episode of the current and final season, “Ron and Jammy.” He appeared multiple times on the NBC sitcom as Pawnee Animal Control employee Harris, popping up most recently in the Feb. 10 episode. The Emerson College grad got his break as a writer on The Sarah Silverman Program, also served a writer-producer on Eastbound and Down and Secret Girlfriend, and was a frequent guest on the Comedy Bang! Bang! podcast. He teamed up with Silverman again to co-star in her 2012 NBC pilot Susan 313, which did not get picked up.

Wittels, who spoke of his battle with addiction and went to rehab, was the drummer of the band Don’t Stop or We’ll Die. He also was known for coining the term “humblebrag,” which he turned into a popular Twitter feed, and in 2012 he wrote the book Humblebrag: The Art of False Modesty about the phenomenon that he called “a specific type of bragging which masks the brag in a faux-humble guise.”