McBain was known as a brave man and a good sheriff that protected Primm. His and his wife's murder was witnessed by Beagle who proceeded to spy on the convicts instead of doing anything else,  leaving the McBains' decapitated corpses behind at the sheriff's office to rot. They were only given a proper burial by the townsfolk of Primm once peace was restored.
↑Beagle: "Well! That was quite a per-dicament you rescued me from, there in the Bison Steve. A most unpleasant experience. Going in alone to rescue a hostage! My brother-in-law was brave like that. Made a fine sheriff. Until the Powder Gangers killed him. Problem is, there's still no law in Primm. What're we to do the next time ruffians menace us and hold us hostage?" (Beagle's dialogue)
↑The Courier: "How'd you end up being a hostage?" Beagle: "I must say it's been the low point of my career in law enforcement... The Powder Gangers stole into town at night and murdered my sister and her husband, the sheriff, in bed, while I was sleeping in the office. I watched them for a bit, waiting for the right moment to pounce and arrest the lot of them. Taking careful notes as I watched. To my dismay, they found me while I waited in the shadows and brought me here." (PrimmDeputy.txt)