Well-known Lambda Legal attorney David Buckel was found dead in a public park in Brooklyn, New York, Saturday, having apparently taken his own life in protest over the use of fossil fuels.

Buckel was on the staff of Lambda Legal, the national LGBT legal defense and education group, for more than a dozen years. For several of those years, he served as coordinator for its national marriage equality project. He also served as attorney on a number of high profile cases, including those involving Jamie Nabozny, James Dale, and Brandon Teena.

Buckel, 60, left the staff about 10 years ago and has been serving as Senior Organics Recovery Coordinator for the NYC Compost Project, hosted by Brooklyn Botanic Garden. The Botanic Gardens website included one article by Buckel, from 2016, that discussed the effort to compost the city’s garbage. The Solid Waste Association of North America spotlighted his work managing “the United States’ largest community composting site that is run entirely on renewable energy.”

Camilla Taylor, acting legal director for Lambda Legal, said “Our hearts are broken.”

“This is a tragic loss for our Lambda Legal family and for the social justice movement,” said Camilla Taylor, Lambda’s acting legal director. “Our hearts go out to all who knew him. David was a beautiful human being who was universally kind to everyone at Lambda Legal, committed to his clients, and devoted to our work.”

The Park Slope Patch reported that Buckel’s body was found in Prospect Park in Brooklyn Saturday morning at 6:15 a.m. by firefighters responding to an alarm. The New York Daily News reported that a suicide note found at the scene in an envelope labeled “For the police” said: “My name is David Buckel and I just killed myself by fire as a protest suicide. I apologize to you for the mess.” The News said Buckel’s business card was stapled to the note and left behind a “longer, neatly typed explanation” of his apparent self-immolation.

The News said the envelope with the “suicide note” was found inside a garbage bag, which was placed in a shopping cart that was found near Buckel’s body. It said the longer note said Buckel hoped his suicide “might bring some attention to the need for expanded actions, and help others give a voice to our home, and Earth is heard.”

As a Lambda staff attorney in 1993, as a Lambda attorney, Buckel represented the mother of Brandon Teena, who was raped and murdered because she presented as a male. He later represented the victims of a number of other LGBT people brutally attacked in hate crimes. Three years later, Buckel was pressing a case against a Wisconsin school district that failed to protect a gay student from bullying. He won a $900,000 award in damages. Then he assisted Lambda attorney Evan Wolfson in the James Dale v. Boy Scouts of America case that went to the New Jersey Supreme Court and the U.S. Supreme Court.

“David was so earnest and caring, hardworking and dedicated, a truly good person,” said Wolfson. “He worked with me on the Boy Scouts case, helping organize amici, and many other cases, and was a friend as well as a colleague over a couple decades.”

In 1998, Buckel urged a federal district court in Utah to order a Salt Lake City school district to grant equal access to a gay student alliance and persuaded the Internal Revenue Service to grant tax-exempt status to a Rhode Island lesbian community group.

In 2006, he testified on behalf of Lambda Legal before the New Jersey Assembly’s Judiciary Committee, urging members to oppose a bill that sought to establish civil unions, instead of marriage equality for same-sex couples.

As coordinator for Lambda’s marriage project, Buckel spoke out in 2002 against a bill seeking to amend the U.S. Constitution to ban marriage for same-sex couples.