“He was fearless and brilliant in his investigation of hypocrisies and double standards in the media, and his contribution was priceless,” his family said in a statement.

Eric Boehlert, a veteran journalist who was a fierce critic of right-wing misinformation and hypocrisy in the news media, died on Monday in New Jersey. He was 57.

Mr. Boehlert was struck by a New Jersey Transit train while riding his bicycle near the Watchung Avenue station in Montclair. His death was confirmed by his wife, Tracy Breslin.

A frequent commentator on television and radio, as well as a prolific writer, Mr. Boehlert never shied away from searing critiques of what he saw as bias in the mainstream press

After more than a decade as a senior fellow at Media Matters for America, a left-leaning media monitoring group, Mr. Boehlert had in recent years started his own newsletter

“I’m devastated for his family and friends and will miss his critical work to counteract misinformation and media bias,” Hillary Clinton,a former U.S. secretary of state,wrote on Twitter on Wednesday.

Born in Utica, N.Y., Mr. Boehlert spent some of his childhood in Indiana before his family moved to Guilford, Conn. He earned a bachelor’s degree in Middle Eastern studies at the Uni

Early in his career, Mr. Boehlert covered the music industry at Billboard and Rolling Stone, before becoming a staff writer at Salon. In 2006, he joined Media Matters.