Osvaldo Elías Castro Hernández[1] (born January 5, 1990), better known by the stage name Darell, is a Puerto Rican rapper and songwriter.

His mixtape La Verdadera Vuelta in collaboration with Ñengo Flow, Anuel AA, Tempo, Tali and Lito Kirino was a major success.

He is most famous for the single "Te Boté" (English: "I Dumped You"), a song recorded with Puerto Rican rappers Nio García and Casper Mágico.

The song reached number one in Sech's native Panama, as well as in Spain, Argentina, Colombia, Peru, Paraguay, Honduras and Mexico.

In the United States, the song peaked at number 34 on the Billboard Hot 100, making Sech's first entry as a solo artist on the chart.