There are murderers and then there are serial killers. There's usually some sort of motive behind most homicides but when it comes to serial killers, motive gets replaced by this psychological urge to kill; most often devoid of any logical reason or personal vendetta against the victim. India has had its fair share of serial killers. Most often, they were eventually apprehended, but there are cases where the wrong person was arrested (and then let go) and then there are some cases that still remain unsolved. These cold-blooded Indian serial killers will send shivers down your spine.

3. Devendra Sharma - The doctor turned killer

Devendra Sharma was a fairly successful doctor of Ayurvedic medicine but he also had a dark side. He wanted to make a quick buck boosting cars and he didn't mind the bloodshed that came with it. From 2002-2004, he stole cars and killed car drivers from many areas in and around UP, Gurgaon and Rajasthan. According to his own confession, he killed about 30-40 men, all drivers. He was sentenced to death in 2008.

4. The Nithari killer(s) - The killings that shocked India

Surinder Koli was the domestic help of Moninder Singh Pandher, a wealthy businessman from Noida. Initially in 2006, they were both arrested in connection to the discovery of skulls of missing children in Nithari village in the outskirts of Noida. The case took many twisted turns and there was a huge media furore over what was really going on. There were accusations of rape, cannibalism, pedophilia and even organ trafficking - some of these had substance, while others were mainly rumours. As of now, Surinder Koli has been found guilty of 5 homicides and is on death row while Pandher awaits his fate as there are 11 other unsolved murders under the same investigation.