Borovkov, knowing that Mokhin has valuable things

Borovkov, knowing that Mokhin had valuable things, during a joint drink, imperceptibly for the latter, poured a large dose of sleeping pills into his glass, which poses a danger to life. When Mokhin fell asleep, Borovkov searched him and took the receipt for the things handed over to the storage room, received them and disappeared.
Options: a) Borovkov took the money, credit card and personal items that were under Mokhov; b) Mokhin, who suffered from heart disease, which Borovkov did not know about, died.