What does 2 Samuel 3:27 mean?

When Abner got back to Hebron, Joab took him aside as if to talk privately. There, he stabbed Abner in the stomach and killed him, getting revenge for his brother Asahel's death. 2 Samuel 3:27 - Modern Text Bible

(Joab murders Abner under the pretense of a private conversation, avenging his brother but also eliminating a rival.)