Hernandez is charged with the June 2013 killing of Odin Lloyd, who was dating his fiancée's sister.
Jurors deliberated for about 90 minutes Tuesday after hearing closing arguments. They return Wednesday.
Hernandez's lawyer, James Sultan, acknowledged for the first time during closing arguments that Hernandez was there when Lloyd was killed. But he described him as a witness, a 23-year-old kid who did not know what to do. Sultan pinned the killing on two of Hernandez's friends.
Prosecutors say Hernandez planned the crime, drove Lloyd to a secluded area, killed him, and then tried to cover it up.