Close Accused Walmart stabber enters not guilty plea Defendant from Falmouth Walmart stabbing pleads. Kelsey Fabian, WCSH 10:04 PM. EDT 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 Mother 'livid' over son's TSA treatment NEWS CENTER Video Forecast City Hall adds regulations to curb vacay rental market in Portland Gov. LePage tends bar in Hallowell, for a cause Lack of temporary workers could crunch some Maine businesses Superintendent of Long Creek resigns amid internal investigation Police searching for man who attempted to shoplift whitener Expensive life-saving drugs could affect municipal spending Green Outdoors: Maine sporting life is going 3-D NEWS CENTER Video Forecast More Stories Carson Blog: #WeekendSnowProbs Mar 28, 2017, 3:26 p.m. NBC News Exclusive: DNC asks all staffers for… Mar 28, 2017, 5:51 p.m. Two Midcoast business owners notify state of intent… Mar 28, 2017, 3:01 p.m.