Harris Wittels, writer for and co-executive producer of NBC’s comedy series Parks and Recreation died Thursday, Los Angeles police said. He was 30.

Reports stated that Wittels died in his home in Los Angeles from a possible drug overdose, according to Fox News. Associated Press reported that police officer Rosario Herrara said he was discovered by his assistant in his home around noon. Wittels was pronounced dead at the scene.

Herrera also said that the death is under investigation. The cause of death could have been a drug overdose; however, Herrera said the exact cause will be determined by the Los Angeles County coroner’s office. Wittels had been reportedly open about struggling with drug use in a podcast last year.

Along with being a writer and co-executive for Parks and Recreation, Wittels had a few acting appearances on the show as one of two “pothead” animal control employees. The show, starring Amy Poehler, is set to finish its seven-season run Tuesday.

Wittels was also given credit for coining the term humblebrag. Oxforddictionaries.com defines the word as brags that are self-deprecating, but are meant to “draw attention to something of which one is proud.” In 2012, Wittels wrote a book Humblebrag: The Art of False Modesty that focused on his Twitter feed devoted to the humblebrag and mocking celebrities.

Additionally, he wrote for other two other TV programs, The Sarah Silverman Program and Eastbound & Down, and performed stand-up comedy.

Many friends of Wittels took to Twitter to mourn his loss. Sarah Silverman tweeted that Wittels was her “baby.” She called him honest “even when it pissed u off” and “brilliant.”

“He loved comedy more than anything,” Silverman wrote.

Comedian Kevin Nealon also expressed his grief via Twitter. He wrote that he was “so sad” to hear of the death of “such a talent.”