Jay DeMarcus (born Stanley Wayne DeMarcus, Jr.; April 26, 1971) is an American bass guitarist, harmony vocalist, pianist, record producer and songwriter, who is a member of the country group Rascal Flatts.
DeMarcus was born in Columbus, Ohio. He graduated from the Tree of Life Christian School in Columbus while living with his mother and sister. He also has a half-sister from his father's side of the family. DeMarcus attended Lee College in Cleveland, Tennessee, from 1990 to 1992. At the time, he traveled and performed as a keyboard player in the Christian music group New Harvest, led by Danny Murray.
In addition to producing for English, he has also produced albums for James Otto, Jo Dee Messina, Austins Bridge and others. He produced the 2006 release for the band Chicago titled, Chicago XXX. He soon became bandleader for Chely Wright. Eventually, he met Joe Don who is now the group's other member. DeMarcus called Joe Don to fill in for a guitarist who had left the band one night.
On March 4, 2010, DeMarcus and his band mates were guest stars on CSI: Crime Scene Investigation, appearing as themselves. In the episode titled "Unshockable" (10.14), he is electro-shocked by his bass guitar during a performance at a Vegas club, leaving him with total amnesia. DeMarcus has continued to explore his acting career, appearing in the film A Country Christmas, as well as episodes of ABC's Nashville and Lifetime's Drop Dead Diva.
On May 15, 2004, DeMarcus married Allison Alderson a former beauty queen who has held the titles Miss Tennessee 1999 and Miss Tennessee USA 2002. DeMarcus met her on the set while filming the video for the Rascal Flatts song, "These Days". Their first child, Madeline Leigh, was born in December 2010. In July 2012, he and Allison welcomed son Dylan Jay.