A District man was sentenced Friday to 18 years in prison for fatally shooting his cousin last summer, following a confrontation that included an argument over a missing ring.

In December, Roosevelt Robinson, 67, pleaded guilty in D.C. Superior Court of fatally shooting Loretta Carswell, 63, outside her home in the 3700 block of 18th Street NE about 10:35 a.m. on Aug. 21.

Immediately after shooting Carswell, Robinson then hopped on his bike and rode down the street to his home a block away and barricaded himself inside the house for 30 hours, thereby turning the quiet neighborhood into a blocked-off zone of heavily armed police, as officers tried to persuade Robinson to come out of the house peacefully.

Prosecutors say Robinson and Carswell had a strained relationship and that he often accused Carswell of having his ring because many of his belongings were in her home. On Aug. 21, when Robinson confronted Carswell again about the ring, Carswell again insisted she had no idea what he was talking about.

In an interview with detectives, Robinson said he told Carswell, “Girl, you know I should kill you for doing what you did,” prosecutors said. Carswell responded, “You can go ahead and kill me if you want to, I done told you I don’t have your ring.” At that point, Robinson pulled out a Ruger .357-caliber Magnum revolver and shot Carswell once in her forehead.

Family members earlier said Robinson was angry with Carswell because she and other family members had ordered Robinson out of the house where he was residing because he had stopped paying rent. The house had belonged to the family.