Was Kalabhavan Mani poisoned?

Investigation is on about Kalabhavan Mani's death but it still remains a mystery if the late actor was poisoned, and if yes, how did he consume the poisoned liquor.

Friends of the actor claim that they were drinking with him from the previous day's evening onwards, but dispersed at 11 pm. However, the next day, Mani was found in a serious condition at 9 am, following which they called a doctor, who arrived at 10 30 am. He was admitted to hospital soon after and declared dead at 7 15 pm on the same day. The claims of the family of the actor that they had no clue about him being admitted to hospital.