Iruttu (transl. Dark) is a 2019 Indian supernatural horror film written and directed by V. Z. Durai. It stars Sundar C, Sakshi Choudhary and Dhansika in the lead roles and Vimala Raman, VTV Ganesh, Yogi Babu, and Manasvi Kottachi in supporting roles. Girishh G. composed the film's music and cinematography was handled by E. Krishnasamy. The film had its theatrical release on 6 December 2019 and opened to generally mixed-to-positive reviews. It was later dubbed in Hindi and released under the title Qatil Saya.