Officers believe the mechanic may have told her things would get better after tensions escalated when the critically ill mother left at least part of the farm to her oldest will.
Mark O’Sullivan, 26, died along with his father Tadg and brother Diarmuid, 23, in a triple suicide that shocked the nation.
The tragedy that occurred last Monday in the family home in Assolas near Kanturk is said to have been caused by a dispute over an inheritance.
A source said, “They came back through some form of promise or persuasion.”
Friends had been concerned about Anne and it is believed that one person was so concerned that they discreetly turned to gardaí on their behalf.
Sources told the Sunday Independent that a “third party” sought advice from Garda.
However, there was no formal complaint and no explanation from a victim, so no investigation into Lake Garda was initiated.
It is believed that Anne and her eldest son have not been welcomed to the farm for the past few weeks and the couple had stayed with a friend outside the village.
That arrangement had been in place since her return to Kanturk after Anne remained in hospital in Dublin.
Anne decided to settle her will and the estate that her father and uncle had given her, as her health had deteriorated.
The 60-year-old and Mark returned to the O’Sullivan’s home on Sunday, October 25 – and hours later three of the four households were dead.
Gardai believe that Tadg, Diarmuid, or both put together an evil plan while Anne and her eldest son were in the capital, and it was invented days or even weeks before the suicide.
The night and the hours before, Tadg, his youngest son, or both, is said to have blown Mark to death.
Tadg and Diarmuid’s house phone and cell phones were also smashed, and the devices were later discovered broken in the house.
It is believed that the couple stood outside Mark’s bedroom at 6:40 am and one or both of them entered and started shooting at him.
The 26 year old died instantly and Anne woke up a short time after the persistent murder to see both men at Mark’s door.
She had no shoes on and was dressed in her nightwear, but she fled to a neighbor’s house on her cell phone to set off the alarm.
It is believed that Diarmuid followed her and destroyed the device, but he allowed her to escape.
Tadg and Diarmuid’s funeral mass was held on Friday, while Mark was buried on Saturday.
Hundreds of people have now sent messages of support to Ann O’Sullivan following the horror death of the three men in Kanturk.
The church heard on Friday a parish “struggle to make sense of the tragedy” that has struck the region.
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