The stabbing occurred around 5:20 p.m. Thursday while the suspect and the victim were aboard the subway train. The suspect pulled out a knife and "without warning or provocation" stabbed the victim -- identified as Jesse Rodriguez -- in the upper torso, according to the Los Angeles Police Department.
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Police said Transit Services Division officers who were at the Pershing Square Station rendered aid to Rodriguez until paramedics arrived.
Rodriguez later died at a hospital.
Police released a photo of the suspect. They said he was last seen wearing a black wave cap, a black long sleeve shirt, dark colored pants, black shoes, and was carrying a black Puma backpack.
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Anyone with information is urged to contact authorities.
City News Service contributed to this report.