American Boxer, "Sugar" Shane Mosley, is ending his boxing career after 19 years of fighting in the ring. The 40-year-old has won various titles throughout his career in three different weight classes.

In 1999 Mosley won the IBF belt and was named fighter of the year by the Boxing Writers Association of America. The apex of his career occurred with him beating Oscar De La Hoya twice. The first win earned him the WBC welterweight in 2000. Once again in 2003, he beat De La Hoya and took home the middleweight title.

Mosley broke the news of his retirement on twitter, saying "Good morning everybody. Just want to thank you for showing me so much love. Loved every moment of it, win, lose, or draw".

The fighter's last three out of four fights were losses. His last fight took place on May 5, where he lost to Mexican fighter Saul "Canelo" Alvarez. His record now stands at 46-8-1.

Boxing has always been a part of Mosley's life, as he started the sport at 8-years-old.  At the 1990 Goodwill Games, he won three titles in the amateur division and a bronze medal.

Despite laying his boxing career to rest, he still plans on keeping the sport in his life. Mosley plans on passing down his gloves to his 21-year-old son, who he will now be training.

"I'm going into the promotional world, I'm training my son. It was a helluva career. I'm happy for all the great memories and all the great fighters that I fought," says Mosley.

"Now it's time to give back. I'm ready to train my son full-time now," Mosley told ESPN.com.

Mosley can hold his head high as he bows out of the boxing league with no record of ever being knocked out, something very few fighters can claim.