A Brooklyn couple who hosted a monthly "self-help" show on public radio killed themselves in their Park Slope apartment, The New York Daily News reports.

Lynne Rosen, 46, and John Littig, 48, reportedly committed suicide by placing plastic bags over their heads and inhaling helium.

They hosted a monthly radio show called "The Pursuit of Happiness" on WBAI that focused on "personal development and growth." WBAI describes them as speakers and "life coaches."

They had a life-coaching company together called "Why Not Now," which held self-help workshops. Lynne Rosen had her own website with this quote from Norman Vincent Peale: "It's always too early to quit."

The couple left behind two notes that essentially said they were killing themselves together, sources told The Daily News.

Neighbors recently began noticing a smell coming from their apartment, which was in an upscale neighborhood where they'd lived for 20 years. The super finally kicked the door in after they saw blood coming in through the floor, The Daily News reported.

"I knew them for many years," an 87-year-old neighbor told The Daily News."They were always respectable."

In June 2011, Travelers Insurance sued Rosen and a number of other therapists in Brooklyn federal court. The insurer claimed Rosen, a licensed clinical social worker, billed it for totally unnecessary psychological tests given to patients who'd been in car accidents.

The insurer agreed to drop the suit in March of this year, possibly because it reached some kind of settlement with Rosen and the other defendants.