Thomas Glenn “Catt” Sirten, a radio DJ and program director whose influence on the Mobile music scene spanned 40 years, has died, a relative confirmed Sunday.

Sirten’s younger brother, Tony Rogers-Sirten, confirmed the news late Sunday. “They found him this morning at the radio station,” he said.

That would be WZEW-FM 92.1, a station with which Sirten’s soft voice and gentle demeanor were irrevocably intertwined.

In 1984, Sirten became program director as the independently owned station took on a new album-oriented format, giving Mobile a quirky and eclectic mix of singer-songwriters, blues and other genres. The station was sometimes classed as Triple-A, meaning adult album alternative.

Sirten’s roles at the station shifted over the years, but it remained a home for his long-running Sunday Jazz Brunch program. In late June, Sirten celebrated his 2,000th Sunday Jazz Brunch broadcast, and appeared to have been working on it at the time of his death.

“With a heavy heart, shock, disbelief and no joy, I must convey to you the loss of the founder of 92 Zew, Catt Sirten,” wrote Tim Camp, the station’s director of operations and programming, wrote in a statement sent out late Sunday afternoon. “Catt left us sometime during the morning of Sunday August 6, while in the midst of producing his beloved Sunday Jazz Brunch program.

“At this time, cause of death is unknown but he was found peacefully asleep listening to the music that he so loved,” wrote Camp. “He left this life doing what he loved in life. All of us at 92 Zew would like to extend our sincere condolences to his surviving family and all the friends that have surrounded him for so many years.”

Murrell said that as medical personnel were transferring Sirten’s body to an ambulance, the day’s Jazz Brunch program was coming to an end. The final song, as usual, was a Hubert Laws flute arrangement of “Amazing Grace.”

For a man whose name was synonymous with radio, it was a poetic end. But Sirten will be remembered for his community spirit as well. Among his other activities was a “Brown Bag” concert series that offered free lunchtime performances by area artists in the spring and fall. Launched in Mobile in 1985, the series most recently took place this spring in Daphne.

Sirten was from north Alabama and had two siblings, including an older sister, Linda. Their mother died in December, Rogers-Sirten said. Rogers-Sirten, a pastor in Tennessee, said that no arrangements had been set but that he did expect a service to be held in the Mobile area.