John Dingell, a Democratic lawmaker from Michigan and the longest-serving member of Congress, died on Thursday, the Detroit News reported. He was 92.

Dingell, who served his final year as a representative in 2015, suffered a heart attack in September and was receiving hospice care on Wednesday, according to several reports.

“I want to thank you all for your incredibly kind words and prayers. You’re not done with me just yet,” Dingell tweeted on Wednesday.

His wife, Rep. Debbie Dingell, added that she was with him at their home in Dearborn.

“I am home with John and we have entered a new phase. He is my love and we have been a team for nearly 40 years,” she wrote on Twitter.

During his nearly five decades in Congress, Dingell was a staunch supporter of the auto industry. He was first elected in 1955 and announced in 2014 that he would not be seeking a 30th term in the House.

He also chaired the House Energy and Commerce Committee for a number of years and played an integral role in passing many environmental laws.