One of Paul's fellow prisoners who was associated with him in sending greetings to the Church at Colossae (Col. 4: 14); but according to 2 Tim. 4: 10 Demas later deserted Paul and went (home?) to Thessalonica.
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"Demas." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Feb 14, 2016. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e509>.
"Demas." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e509 (accessed Feb 14, 2016).