Tarik Francis, 29, showed little emotion as he sat listening during the second day of his double murder trial in Bridgeport Superior Court Wednesday.
If convicted, Francis could face a term of life in prison without the opportunity to ever be free again.
Francis is charged in connection with the murders of his girlfriend, 19-year-old Candace Goodwin, and Austin Burgher, a close friend of his father's.
The victims were fatally shot in a house on Platt Street in the North End of Bridgeport in 2021.
The jury heard testimony from a police detective and a forensic pathologist; and they saw graphic crime scene video.
The trial is expected to continue into early next week.