In "Head Case", Beckett and Castle learn that Randolph was the person funding Lester Hamilton's research, but when they went to question him, Randolph explained that Hamilton wanted to end it with Randolph and had planned to post his research on the Internet. Randolph became a suspect in Hamilton's murder due to the fact that he own a high-caliber gun that was fired the same morning the latter died. However, Randolph's alibi about him shooting a pigeon that was disturbing him checked out as CSU found the pigeon corpse near his apartment.