Denna Campbell cold case arrest police.

Authorities say a man charged this week with fatally shooting a police officer in her Maryland home nearly 30 years ago was the officer’s live-in boyfriend and had blamed her 1995 killing on a burglary. Amir Jalil Ali was arrested Tuesday on a first-degree murder charge. He initially was charged in 1995 with killing 24-year-old Denna Fredericka Campbell, an officer for the Metropolitan Police Department in Washington, D.C. But the charges against him were dropped two months later by prosecutors in Maryland’s Montgomery County. Police officials announced Ali’s arrest on Wednesday.