According to officials, armed men killed a traditional ruler and abducted his wife and another person in southwestern Nigeria.
On Thursday night, gunmen attacked the palace of Segun Aremu, a retired army commander and monarch known as the Olukoro of Koro.
It is unclear who the shooters are or whether they are demanding a ransom.
This latest assassination and kidnapping comes only days after protesters called for a declaration of emergency to address the issue.
Some 50 civil society organisations want President Bola Tinubu to make that statement, claiming that more than 1,800 individuals had been abducted since he took office in May.
Governor AbdulRahman AbdulRazaq condemned the assassination of Koro's Olukoro as "reckless, shocking, and abominable" and pledged that those guilty would be apprehended.
Police said a search is underway.
Earlier this week, kidnappers abducted five pupils and four teachers in adjacent Ekiti state and demanded a ransom of 100 million naira ($110,000; £87,500) for their release.
A top government official was kidnapped on Wednesday night in Abuja's Bwari district, not far from the house of six sisters kidnapped for ransom last month with their father.
When the ransom wasn't paid on time, one of the girls was shot and killed.
Another Abuja neighbourhood, Kubwa, has seen the kidnapping of two girls lately in the Chikakorie neighbourhood. About $25,000 is what their kidnappers have wanted into them.
In recent years, kidnappings for ransom have become more common in Nigeria, where armed groups have begun to target people of both rural and urban regions, as well as drivers and students.
