Best known for her roles on the television series "My Name is Earl" and "The League," the actress also appeared in the Academy Award-nominated, 2012 film "Flight."
Velazquez will play Deputy D.A. Emma Rios on "Major Crimes."
"Newly assigned to the Phillip Stroh case, Emma interviews Rusty [played by Graham Patrick Martin] about his involvement as a key witness in the murder case. She immediately causes a stir within the department, coming into conflict with Captain Raydor [played by Mary McDonnell] when she questions Raydor's intentions as Rusty's guardian and challenges her authority," a synopsis said.