But more often than not, security agencies do not make a headway in some of the cases. Here are some of the unresolved murder cases of 2017 from different parts of the country:
In Lagos, despite efforts by the Lagos State Police Command to put an end to killings suspected to have been carried out by the Badoo cult, which was notorious for smashing the heads of its victims with mortars or stones, the perpetrators of many of the killings have never been caught.
In March 2017, a woman and her three children were killed in an uncompleted church building at Agbowa, near Ikorodu, Lagos, by assailants who have remained at large.
The children, who were aged four, five and nine were found dead while their mother who survived the attack with fatal injuries later died in the hospital.
The police put the time of the killing at about 3 am in the morning. However, the investigation into the case never yielded any suspect.
Few weeks earlier, the body of a woman who had been reportedly raped and murdered, was dumped in a shallow river in Umuahia, Abia State.
The police in the state confirmed at the time that she might have been raped and murdered by hoodlums who disposed of her body in the river but no suspect was arrested in connection with the case.
In Benin, Edo State, it has been nine months since the Founder and Head Pastor of Love Fire Ministry, Godwin Emmanuel, was shot dead along Oko Central road, Benin, Edo State.
The police have made no headway in tracking down the perpetrators.
The pastor was said to be on his way to distribute food items to indigent members of the church when he was shot dead by the gunmen.
A member of the church said his killers pretended to be pushing a car that broke down and when the pastor stopped for them to pass, he was gunned down. The killers have not been found since then.
Ondo State also has its share of unresolved murders.
In July, a young woman, Bosede Akinlalu, 24,was found dead in her parents’ farm in Ode Aye, in the Okitipupa Local Government Area of Ondo State.
Reports had suggested that the victim had gone to the farm in company with two men when they encountered the armed assailants.
They fled, but the assailants caught up with Akinlalu, whose body was later recovered from the scene with machete cuts.
There has been no lead in the matter but the Public Relations Officer of the Ondo State Police Command, Mr. Femi Joseph, gave assurances that the command would get the killers.
At about the same time, some men who are still at large, killed the Vice Principal of the Community Secondary School, Nkek, Mr. Aniekeme Essien, in the Ukanafun Local Government Area of AkwaIbom State, during school hours.
A few days before the attack, the victim was said to have received a letter in which N1m was demanded in exchange for his life.
Essien was shot in the presence of his students by the gunmen who arrived the scene in a commando style.
The police said they were still on the trail of the gang responsible for the killing.
In the same month, an Osun State Permanent Secretary, Mrs. Olufunke Kolawole, was kidnapped and hacked to death while travelling from Osogbo, the state capital, to Abuja.
The victim, who was travelling in her official vehicle to attend a programme, was attacked along the Okene-Abuja highway.
Her driver was reportedly beaten to a coma, while she was taken away. Few hours after her abduction, her body was found by the roadside, with signs that she had been hacked to death by her assailants.
Her killers have not been found since then.
In another incident in Ore, Ondo State, a masked gunman, sneaked into the vicarage of a Christ Apostolic Church at Ago Gbooro area of the town and shot the pastor of the church, Oluwarotimi Akinroyeje, where he slept.
The Police Public Relations Officer of the Ondo State Police Command, Mr. Femi Joseph, said the police were treating the case as a suspected assassination. However, since investigation into the case was launched,the police have made no headway.
Some gunmen also killed a woman and her son in Ayakoromo community in Burutu Local Government Area Delta State that same month.
The killers were suspected to be sea pirates.
Report suggested that Anetorufa Mokor, 48, and her son, Timi Enai, 29, were in a fishing camp along the Egolegbene Creeks when they were shot dead by the gunmen.
The case has since gone on unresolved since then.
Two months after, some gunmen also shot dead the state provost of the Vigilance Group of Nigeria in Delta.
The victim identified as Folorunsho, was killed in Odibo Estate in Effurun, Uvwie Local Government Area of Delta State. No suspect has been arrested in the case three months after.
In October, a former Head of Service in Plateau State, Mr. Moses Gwom, and two other victims, were killed by some gunmen suspected to be Fulani herdsmen in a night attack on Wereh Village (Dorowa) in Barkin Ladi Local Government Area state.
The case was just one of many others suspected to have been carried out by herdsmen in northern Nigeria.
Less than three weeks ago, some men suspected to be herdsmen also killed six policemen in Adamawa State.
A police spokesperson in the state confirmed to AFP that the policemen were ambushed while they were going to Dowaya village with the intention of disarming Fulani herdsmen who were reportedly moving around with arms.
In both cases, like many others blamed on herdsmen, no suspects have been arrested for the murders.
In another case, two weeks ago, a former Bayelsa Commissioner for Investment, Trade and Industry, Ayekeme Masa, in Bayelsa State was shot dead in Yenagoa by gunmen who have continued to elude capture.
He was said to have walked in on an argument between his wife and the killers. He was shot before he could escape.
Also, last week, a woman was shot dead by suspected kidnappers in Aba, Abia State, for refusing to step out of her vehicle.
The victim, Mrs. Ifeyinwa Morah, was heading home at about 7pm that day when she was ambushed by the gunmen.
Reports said that the gunmen told her to step out of her SUV and enter their own vehicle, but when she was reluctant to obey, they shot her at close range.
The police in the state said efforts are still on to track down her killers.
On November 2, the Chairman of the Non-Academic Staff Union of Secondary School, Science and Technology Education Board in Kogi State, Abdulmumini Yakubu, was murdered by some gunmen at Ozuwaya, in Okene Local Government Area of the state.
His family said that the gunmen numbering five alighted from a Toyota Sienna mini-van and opened fire on the victim as he was performing ablution in preparation for prayers.
Saturday PUNCH learnt that there have been no lead in tracking down the suspects, since the incident occurred.
In another case which occurred in the first week of December, some gunmen invaded a funeral in Benin, Edo State and killed the deceased’s son.
The victim, Dupe Idahor, 42, was said to be under a canopy with some of his friends and relatives when the gunmen arrived in a car and opened fire on him.
Family and sympathisers at the funeral fled and abandoned the corpse of the victim’s mother, who had died aged 82.
The spokesperson for the Edo State Police Command, Chidi Nwanbuzor, said efforts were still being made to track down the killers.
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