Lee Thomspon Young dead: 29-year-old actor dies in Southern California

Lee Thompson Young, the 29-year-old actor who starred in shows such as The Famous Jett Jackson and Rizzoli & Isles, was found dead Monday inside his Southern California apartment.

Los Angeles Police Department officials tell ABC News that they don't yet know how or why Young died.

Young also appeared in prominent films including Friday Night Lights and Akeelah and the Bee.

Most recently, Young played Detective Barry Frost on Rizzoli & Isles on TNT since the show began in 2010.