In Dedham, Massachusetts, Mila Adams testified Diggs slapped her, put her in a headlock and made breathing difficult during a December 2 incident.
Diggs, 32, pleaded not guilty, while defence lawyer Andrew Kettlewell told jurors no assault occurred and cited no witnesses, medical records, photos or video.
Prosecutors say the attack followed a verbal argument; the defence says the dispute was over money and a planned Miami trip. The NFL is monitoring the case as Diggs remains unsigned after his March release.
Why does Stefon Diggs' $16.8M salary get more attention than the felony strangulation charge he faces?
With no physical evidence, can a jury convict an NFL star based on his chef's testimony alone?