AUGUSTA — The youngest son of 92-year-old Aurele Fecteau denied killing his father Friday under repeated questioning by the prosecutor in the murder trial of a third man, Roland L. Cummings. On the witness stand, David Fecteau, 49, of Benton, testified he did not go to his father’s house around May 20, 2014, and stab him 16 times. The testimony came during the second day of the trial of Cummings, 46, of Waterville, who is accused of stabbing Fecteau to death in his Waterville home, as well as burglarizing the home and stealing two rings. Cummings has denied the charges and his jury trial is underway at the Capital Judicial Center. It was there on Friday that Assistant Attorney General Leane Zainea asked Fecteau about the killing after defense attorney Darrick Banda said the younger Fecteau could not account for his whereabouts. Banda also asked him why he inquired about his father possibly being stabbed before being told about the cause of death. David Fecteau also testified that Cummings had lived with him in his Benton home about a year prior to Aurele Fecteau’s death and had done some work at the older man’s home. The defense has suggested someone else killed Fecteau, and Banda asked David Fecteau about his feelings toward his father. The younger Fecteau testified he could not recall telling a state police investigator that his father always put him down. So Banda played an audio file of the May 24, 2014, interview.