(Chicago, IL) — Prosecutors in Chicago say a former Northwestern University professor killed a man as part of a sexual fantasy-suicide pact with his online lover. Wyndham Lathem is accused of brutally stabbing and hacking his younger boyfriend to death last week as part of a fantasy with Andrew Warren. Prosecutors told a judge yesterday that Lathem flew Warren to American from Britain, and then Warren helped as Lathem attacked his boyfriend. The two were supposed to then kill themselves, but prosecutors say they backed out.