Compare and contrast Matt's motives in "Killings" by Andre Dubus with Emily's in "A Rose for Emily" by William Faulkner.
In "Killings," Matt Fowler shoots and kills Richard Strout because Strout has murdered his youngest son, Frank, in a premeditated act sparked by jealousy. Matt's motive is pure revenge, and he has an accomplice in his friend Willis. They carefully plan Strout's murder and cover up his disappearance. Matt tells his wife, Ruth, what he has done.
In "A Rose for Emily," Emily Grierson kills Homer Barron with rat poison. Homer was a Yankee with whom she had been seen publicly and was presumably in a romantic relationship, but her remaining family and people of the town judged it inappropriate. Despite the fact that it looked like Emily and Homer would marry, the marriage did not happen, and Homer Barron disappeared after being seen going into Emily's house. Years later, Homer Barron's rotted remains are found in Emily's bed after she has died.
The motives for the deaths are mostly dissimilar. Matt kills Strout because he feels he must avenge his son's death. Emily Grierson's motives are less obvious, but it is arguable that she murders Homer because he is going to leave her. Because Emily kept Homer's remains with her, it is possible that she had a pathological desire to keep their relationship "alive." Emily does not have an accomplice, and she tells no one of her crime.
It is also possible to argue that the murders are similar in that Emily's murder can also be seen as an act of revenge if she was angry at having her reputation ruined and being abandoned by Homer. Both murders are premeditated and covered up by the perpetrators.