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 Climber who died on Katahdin is identified Friends reveal details about shooting victim Potholes NEWS CENTER Video Forecast Deadly force through an officer's eyes New Hampshire woman arrested after standoff vs. police NEWS CENTER Video Forecast Boy with autism gets his own 'Zamboni' Friends remember Portland man shot/killed on Saturday Man pushes for birth certificate changes More Stories Firefighters battle flames at Winthrop post office Feb 21, 2017, 9:20 a.m. Mayor Wants To Fast Track Body Cameras After Deadly Shooting Feb 21, 2017, 6:01 a.m. Trump names H.R. McMaster as new national security adviser Feb 20, 2017, 3:42 p.m.