[Editor's note: This story discusses suicide. If you or someone you know is having thoughts of suicide, please contact the National Suicide Prevention Lifeline at 1-800-273-TALK (8255)]

A Miami news anchor committed suicide this week because he was afraid he suffered from the same form of dementia that took his mother’s life, his family claims.

Todd Tongen, who worked for ABC affiliate WPLG for nearly three decades, was 56. The station confirmed the weekend anchor’s cause of death on Wednesday.

"We are shocked and saddened by the death of Todd Tongen, but we are choosing to remember how he lived," WPLG President and CEO Bert Medina said in an online statement. "Todd was an incredibly talented journalist. He spent 30 years at WPLG telling the stories of the people in our community and giving so much of himself to this community. He was an incredible person. He lit up the room with his warm personality.

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Todd's brother, Dr. Scott Tongen, told WPLG he wasn't sure if the incident was planned.

"I don't really think he was thinking about ending his life, as far as I know," said Scott, noting the two had planned upcoming trips to Las Vegas and Canada. "But there was clearly something that was bothering him. He left some garbled messages that we haven't seen yet, but there was a simple note that said he was lost and to forgive him."

Scott said he believes his brother was afraid he had Lewy body dementia — a type of progressive dementia that killed their mother in 2017, after experiencing balance issues similar to what their mom faced.

"I'm convinced that he thought he had it," Scott said. "Whether there was conclusive evidence or not, I think he thought he had it, and that may have been enough."

Dementia with Lewy bodies leads to a decline in thinking, reasoning and independent function, due to abnormal microscopic deposits that cause brain cell damage over time, according to the Alzheimer’s Association.

It’s the same disease that currently afflicts billionaire media mogul Ted Turner. Robin Williams suffered from the disease before his own suicide at age 63 in 2014.

Todd began his broadcasting career in 1983 as a radio disc jockey in his native Minnesota before signing on with WPLG in December 1989.

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One of his most popular segments was "10 Taxi," in which he drove guests such as comedian Joan Rivers and actor Vin Diesel in a 1967 Checker cab. Viewers also watched him train with the Miami Dolphins and fly with the Air Force Thunderbirds.

He is survived by his wife, Karen, and his two sons, Tyler and Ryker.

The Associated Press contributed to this report.