Killing is a sin) is a 2023 Indian Tamil-language crime thriller film written and directed by Dayal Padmanabhan and produced by Pratap Krishna and Manoj Kumar under Einfach Studios.

In a small village located deep in Tamil Nadu, a poor family consisting of aged parents Karuppusamy (Charle) and Valliyammal (Easwari Rao) and their spinster daughter Mallika (Varalaxmi) receives a visit from a fortune teller.

On the same day, a stranger, Arjunan (Santhosh Pratap), arrives at their house and asks if he can stay there for the night.

The family has been struggling due to severe drought in the village and Mallika could not get married as they are unable to give the dowry demanded.

Arjunan shows them a box full of money and jewels and says that his luck changed by working hard, assuring them that so could theirs.

They all consume the poison intended for Karunakaran, and Karuppusamy uses all the cotton in the house to set it on fire and burns himself along with it.

"[5] A critic of Dina Thanthi gave a mixture of review and said that "It is special that director Dayal Padmanabhan has directed the crime and thriller story without boring it.