PRINCE GEORGE’S COUNTY, Md. ( DC News Now) — A man was arrested Friday for allegedly murdering his mother’s boyfriend, according to the Prince George’s County Police Department (PGPD).

Kevin Derr, 51, was convicted of first-degree murder after he stabbed his former girlfriend, 47-year-old Wendolyn McKoy, to death in April 2024. The jury found Derr guilty on five counts, which ...