Close Accused Walmart stabber enters not guilty plea Defendant from Falmouth Walmart stabbing pleads. Kelsey Fabian, WCSH 9:04 PM. EST October 13, 2016 CONNECT TWEET LINKEDIN GOOGLE+ PINTEREST PORTLAND, Maine (NEWS CENTER) -- A homeless man accused of stabbing and killing a man in a Walmart parking lot has plead not guilty to his murder charge. Kenneth Briggs was charged with the murder of Roger Nelsen. Nelsen was found laying in a pool of blood in Falmouth Walmart parking lot back in August. Briggs was not required to enter a plea during his initial court appearance and was ordered to have a mental evaluation. The evaluation has been completed and the results have been pending. Briggs' attorney Molly Butler Bailey stated that she is not confident that Briggs is competent enough to understand the charge. He is being held without bail. Copyright 2016 WCSH CONNECT TWEET LINKEDIN GOOGLE+ PINTEREST JOIN THE CONVERSATION To find out more about Facebook commenting please read the Conversation Guidelines and FAQs Leave a Comment TRENDING VIDEOS NEWS CENTER Video Forecast NEWS CENTER Video Forecast Three people injured when car hits motorcycle in Orrington More Stories Pastor Kills Daughter in Murder-Suicide: Police Dec. 9, 2016, 6:49 a.m. Waterville homeowner sued over woman's fatal fall Dec. 9, 2016, 9:42 p.m. Tom Johnston Blog: Come Monday, it'll be all white.… Dec. 9, 2016, 8:44 p.m.