On the morning of February 6, 2019, Officer Matthew Rittner, 35, a 17-year veteran of the Milwaukee Police Department, was mortally wounded while serving a no-knock search warrant at a duplex on South 12th Street. Officers announced their presence as they tried to breach the door; a man inside fired through the door with an AK-47, striking Rittner in the chest. He was taken to Froedtert Hospital and later died of his injuries.

Twenty-six-year-old Jordan P. Fricke was arrested at the scene and charged with first-degree intentional homicide, two counts of first-degree recklessly endangering safety, and maintaining a drug trafficking place. Fricke told investigators he thought he heard a loud noise and yelling and was unaware it was police, though he said he did hear the word police; his girlfriend said she heard officers identify themselves. At trial the defense argued self-defense, but a jury found Fricke guilty on all counts in July 2019 and he was sentenced in October 2019 to life in prison without parole.

Did anyone in the neighborhood see activity at the duplex before the warrant service or hear anything that morning?