The actor is thought to have taken his own life on Thursday (April 23) while visiting family in Texas, US reports claim.
Sawyer appeared in Everybody Loves Raymond in the role of Geoffrey Barone, alongside his twin brother Sullivan (Michael Barone) and his real-life sister Madylin (Ally Barone).
He was only 16 months old when he first started on the CBS sitcom in 1996 and starred in 139 episodes through till 2005.
Ray Romano, Patricia Heaton, Brad Garrett, Doris Roberts, Peter Boyle and Monica Horan also appeared in the series.
Madylin paid tribute to her brother on Facebook, saying: "At this time I would like to encourage everyone to reach out to the ones you love. Let them have no doubt of what they mean to you."
Suicide is preventable. Individuals who are affected by this story or are experiencing suicidal feelings, please contact Samaritans on 08457 90 90 9008457 90 90 90 (www.samaritans.org) or Mind on 0300 123 3393 (www.mind.org.uk).
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