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 Lakes Region shootings Police investigate suspicious death in Westbrook Naples police shooting NEWS CENTER Video Forecast NEWS CENTER Video Forecast WCSH Breaking News Staying active during the holidays More Stories Two baby sisters from Houlton die from radiator steam burns Dec. 8, 2016, 12:58 p.m. Humbling ceremony for Coles, other Pearl Harbor survivors Dec. 8, 2016, 9:12 a.m. One dead after crash in Standish Dec. 8, 2016, 6:21 a.m.