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.

Many manhunts end quickly, but the man accused of killing four people in rural Montana appears to have disappeared into the kind of wilderness that helps elude pursuers.

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.