It was a pair of chappals, left behind by the assailant near the crime scene, that turned out to be the most important evidence that helped the investigators to nab Amiyoor, a native of Assam.
The chappals were recovered by the investigators from a canal near Jisha’s house during the early stages of the investigation itself.
The footwear was found to be one normally used by the migrant labourers working in the construction sector. Detection of blood stains and blotches of cement in the chappals strengthened the suspicion.
The police then shifted their focus to migrant workers. Simultaneously, they also conducted a probe into the contacts and phone calls in Jisha’s cell phone. On examining the phone, police realized that Jisha had contacted some migrant workers.
The police recorded the statements of Jisha’s mother and sister. However, they did not receive any clues about the assailant from them. The investigation was then widened to people who were involved in the construction works of her house.
The police collected statements from the people who run footwear shops in and around Perumbavoor. This is when the police got a vital clue from a staff of one shop.
The police prepared the latest sketch of the assailant using the details given by this particular staff. The visuals of a person resembling the sketch and wearing a yellow shirt was captured in the CCTV footage of a nearby fertilizer shop.
The Kerala police sent five teams of investigators to five states to look for the suspect. When one of the teams reached Assam, the suspect fled the state and came back to Kerala.
Finally, the suspect was nabbed from the border region in Palakkad district.