DETROIT — A suburban Detroit man was sentenced Wednesday to at least 17 years in prison for killing an unarmed woman who appeared on his porch before dawn.

Theodore Wafer was convicted of second-degree murder in the Nov. 2 death of 19-year-old Renisha McBride. Before he was sentenced, the Dearborn Heights man apologized to McBride’s family, saying he killed a woman who was “too young to leave this world.”

“I will carry that guilt and sorrow forever,” said Wafer, often pausing to control his emotions.

Wafer was convicted last month after a nine-day trial that centered on whether the 55-year-old had a reasonable and honest belief that he was in peril. He testified that he was awakened by pounding on his doors and shot McBride because he feared for his life. A jury rejected his claim of self-defense.

Prosecutors recommended at least 17 years in prison for Wafer.