Nicholas Stanley, 35, was charged with murder over the fatal shooting of Allen Cogswell, who was recently released from prison for sexually assaulting Stanley's family member.
Jacob Ackerman, 43, was charged with second-degree murder and armed criminal action in connection with the death of his brother, who was found dead with a gunshot wound to the head.
James Vanderleest, 21, and his 48-year-old father, David, have been arrested in connection with the death of Vanderleest's ex-girlfriend's 2-year-old son.