The suspect accused of fatally shooting four people at a Montana bar and who remains at large struggled with mental health issues, but was denied services from agencies that were supposed to help, according to his niece.

Police are looking for Michael Paul Brown, 45, after four people were shot and killed in The Owl Bar in the small town of Anaconda, Montana.

As the search for Michael Brown enters its sixth day, a local outdoor expert describes the challenging wilderness terrain that's complicating the manhunt for the suspect in the Anaconda bar shooting.