The old marina (aka shayna rose) left the fresh beat band at the end of season 2 she decided to leave the fresh beat band and get married by do other things in life. Shayna rose was originally replace by Tara perry who plays the new Marina. Tara perry started the role as marina in the beginning of season 3.
Marina from the Fresh Beat Band was played by Shayna Rose. She reportedly left the band in 2011 to pursue other projects and to get married. She is now part of an all girls comedy skit site called Miss Funny.