The body of 46-year-old Kapapero Ndano was found with stab wounds on Monday at the Tumweneni informal settlement, Rundu.
The lifeless body was found by a passer-by in the Tumweneni sewerage yard.
The deceased was stabbed with an unknown sharp object several times, and she died on the spot.
It is alleged that Ndano was last seen on Sunday evening by her neighbors.
According to her eight-year-old son, Ndano was on a phone call with an unknown man when she locked him in the house and left.
The deceased is suspected to have been raped before she was murdered.
The police, however, interrogated Ndano's boyfriend, who is still in their custody.
Police statistics indicate that Namibia recorded an increase in violent crimes, particularly sexual gender-based violence, murder, and assault.
Rundu, in particular, has seen an increase in certain crimes in 2023 compared to 2022, according to statistics provided by the Kavango East Regional Police.
Last year, 25 rape cases were reported, but they increased to 31 this year.