In this Feb. 7, 2018, file photo, featherweight boxing champion, singer featherweight boxer, Kalimba Singleton, speaks during a news conference in London.

Singleton’s family and fans said the singer died Saturday, Feb. 8, 2018 in an apparent suicide.

He was 37.

The singer’s death is the latest in a string of suicide deaths for Kalimbitan Singleton who was scheduled to headline his fifth boxing match on Sunday.

His death is not believed to be linked to any other problems with the singer, the singer’s family said in a statement.

(AP Photo/Matt Dunham, File) Singleton began his boxing career in 2007, but did not win a title until 2010, when he defeated a man named George Pérez in a seven-round decision in an eight-round fight.

The fight, which was televised nationally, earned him a record of 11-3, including six knockouts, according to boxing site

Singler won two world titles before retiring from the sport in 2014.

He said the loss to Péres marked the end of an era, but said his desire to continue to fight had been driven by the emotional toll it had taken on his family and the fans who followed.

Singelton said the fight had a profound impact on him.

“I feel like I’m the only one who can say that,” he said.

“I had to say goodbye.

I didn’t even get a hug.

I got no words to say how sorry I am.”

He added: “My love for boxing is gone, and I want to be a fighter.

I want a career in boxing.

But my family is here.

My love for this sport is here and it will never be gone.”

Singleton said he wanted to honor his family’s memory, but that he would be taking time off.

He also said he would not be taking his last fight.

“The last time I fought was when I was 33, so I’m going to take a break and take time off,” he told The Associated Press on Saturday.

“But I know I have my family.

My family is my biggest support.

So I’ll fight when I’m ready.”

The singer said he had tried to call his family since the fight but couldn’t reach them.

“They were just like, ‘I’ll call you later,'” he said in an interview on the show.

“So I’ll just leave a message and then call them later.”

Singler said he did not feel he needed to call the media.

“There are people that love boxing that want to talk about this,” he added.

“It’s a sad day, and it’s a shame.”

Kalimbeans death is another loss in a spate of recent suicide deaths of top boxers.

On Monday, former UFC middleweight champion Daniel Cormier died after a weekend of heavy partying.

In December, UFC welterweight champion Georges St-Pierre, who has battled with depression and substance abuse issues, died.

In March, former heavyweight champion Mike Tyson was found dead at a New Jersey home.

A month earlier, former world heavyweight champion Vitali Klitschko, who was known for his violent style and aggressive style of fighting, died after an apparent heart attack.