きっと彼は殺人の罪を犯している。

surely; undoubtedly; almost certainly; most likely (e.g. 90 percent); sternly; severely; having no slack; rigid; stiff; tight; suddenly; abruptly; instantly

he; him; his; boyfriend

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

murder

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

crime; sin; wrongdoing; indiscretion; penalty; sentence; punishment; fault; responsibility; culpability; thoughtlessness; lack of consideration

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to commit (e.g. crime); to perpetrate; to make (e.g. mistake); to break (e.g. rule); to violate; to transgress; to contravene; to rape; to violate; to ravish; to deflower