Jǐng / fāng / huái / yí / tā / shā / rén / miè / kǒu / yǐ / fáng / mì / mì / bèi / xiè / lòu

警方怀疑他杀人灭口，以防秘密被泄露。

The police suspected that he killed someone to prevent a secret from being revealed.