“We know who she was,” Ms. McBride said. “She was a regular teenager. She wasn’t violent. Her life mattered.”

Walter Simmons, Renisha McBride’s father, said he did not believe race was a factor in her death. “I think he was mad and was ready for whomever came to his door,” he said of Mr. Wafer.

The jurors declined to speak to reporters after the verdict was announced on Thursday afternoon. Mr. Wafer is to be sentenced on Aug. 25.

During a two-week trial, jurors heard from 27 witnesses, including Mr. Wafer, who described the events on the night Ms. McBride was killed. A friend of Ms. McBride’s testified that earlier in the evening, the two drank vodka and smoked marijuana. Just before 1 a.m., Ms. McBride hit a parked car within the Detroit city limits, left the scene of the accident and rejected help from neighbors, witnesses said. One witness said that Ms. McBride, who appeared disoriented and was bleeding from her injuries, brushed off a neighbor’s plea to wait for an ambulance.

Her whereabouts for the next several hours remain a mystery. But sometime around 4:30 a.m., she approached Mr. Wafer’s home, a small house on a corner lot. He testified that he was asleep in his living room when he heard loud pounding on the front door, then on the side door.

Mr. Wafer, who has no landline phone, said that he frantically searched for his cellphone, but could not find it. As the banging continued, he said, he went to a closet and retrieved his Mossberg 12-gauge shotgun, which he had loaded less than two weeks earlier after vandals had paint-balled his vehicle.