Ladd was the inspiration for Tom Petty's "The Last DJ."
"Happy memories, rock in peace Colin," the legendary rock band wrote.
The artist was performing at a private event in Bahia when he collapsed onstage.
The singer had recently been hospitalized with encephalitis.
The 1971 hit was her first single for Stax Records.
The industrial rock band confirmed that their founding member died after suffering a stroke.
Marty and his brother Sid brought a trippy sensibility to children’s TV and brought singing siblings Donny and Marie Osmond and Barbara Mandrell and her sisters to primetime.
The musician died after a yearlong battle with cancer.
"Nashville will never see another Abe Stoklasa," said Lady A member Charles Kelley, via a social media post. "I’ll miss you my soft spoken friend."
The rocker died on Oct. 29 after a battle with colorectal cancer.