After working so hard he had knocked out the boxer Rafael Ruelas in 5 minutes in 1997.
In 1999 he had face the hard times hitting Felix Trinidad, one of the most anticipated fights of the decade.
Haim died from a suspected overdose at his mother's apartment in Los Angeles.
De La Hoya tweets, "I'm sooooooo devastated right now.
Boxer Oscar De La Hoya's niece has confirmed reports she was dating tragic actor Corey Haim at the time of his death on Wednesday (10Mar10).
Reality TV star Daisy De La Hoya, who fronts VH1 show Daisy of Love, has taken to to pour out her emotions about her lover's death.
Oscar De La had started his boxing career since he was a child.