In what law officials called a "crazy and bizarre" criminal case, a 65-year-old Addison Township woman has been charged with first-degree murder in the throat-slitting death of her 29-year-old son and the blunt force slaying of his 7-month-old daughter -- the woman's grandchild.

The deaths occurred sometime the night of Nov. 22, said Oakland County Sheriff Michael Bouchard. The next morning deputies came to the home and found the murder suspect sitting on a couch with a slashed left wrist, "bleeding into a bucket," in an apparent suicide attempt, Bouchard said. Nearby was the suspected murder weapon -- a box cutter, he said.

Arraigned today on two counts of first-degree murder was Sylvia Marie Majewska, who was being held under guard in a Pontiac hospital as she recovers from lacerations to her arms, authorities said.

There was no obvious motive for the slayings of Daryne Gailey and his infant daughter Charley Lillian Hendrick at the dad's Oxford Township home, authorities said.

"For whatever reason, (Majewska) came to the conclusion that son and her grandchild would be better off dead," Bouchard said today. He spoke at a news conference in Pontiac at which he laid out the details of the case against Majewska, who has been hospitalized since the slayings.

The baby's body was found by deputies "dressed and tucked away like it was going to sleep – very sad," he said.

Police found strong evidence that "there was premeditation and a plan" by Majewska to commit the murders, including a new car seat for the baby that had with it a receipt with Majewska's notations "indicating that she planned to return it, that it won't be needed anymore," Bouchard said.

Majewska was a highly manipulative mother to her cognitively impaired son, Bouchard added.

"We certainly have information that she was an angry woman and a controlling woman," he said. Investigators had turned up a retail store's video filmed during a transaction with mother and son, he said.

"She was very much in charge, berating him, in that encounter in the store," he said.

Majewska lived alone in Addison Township but regularly spent the night with her divorced son when the baby was there for visitation under an arrangement ordered by the father's divorce settlement, police said. Gailey had lifelong cognitive learning disabilities and a seizure disorder. As a result, his mother was appointed his guardian when he was a child, court records show.

Medication that Gailey took likely would've made him sleep soundly and wake with difficulty, Bouchard said. The man left a trail of blood from his bed, where he was initially attacked, to the bathroom of the house, where deputies found his body, Bouchard said.

The deputies were called to the home on a Sunday morning, hours after the slayings presumably occurred. The baby's mother, Amanda Hendrick, had reported to Majewska's ex-husband that the baby was overdue to return from an overnight visit with the father. That prompted Majewska's ex-husband to call police, Bouchard said.

Oakland County records show that the deaths of the infant and father came 17 days after Gailey's divorce was finalized. Sylvia Majewska filed on behalf of her son for his divorce from Amanda Hendrick Gailey in March, just six months after they had married, records show. Previously, she had tried to have the marriage annulled, the records show.

With the divorce pending, Majewska also filed for a protection order against her son's wife, saying Hendrick was bipolar and had grown increasingly violent, and claiming that she'd kicked her son in the groin and thrown a cell phone at him, according to court records. Yet neighbors told the Free Press last month that they had never seen trouble between the couple.

Oakland County Circuit Judge Lisa Gorcyca granted the order, although Amanda Hendrick denied the allegations. The order was lifted in July, court records show.

DaryneGailey had worked for 15 years as a clerk at the Kroger store in Lake Orion, less than two miles from his house, according to woman at the store who identified herself as an assistant manager but who declined to give her name.

"We all loved Daryne – he had a great big heart," she said.

Gailey was described by friends, neighbors and coworkers as a gentle person and loving father to his baby daughter Charley.

Charley's great uncle, David James of Granville, Ohio, spoke with the Free Press on behalf of the Hendrick family on Monday:

"Amanda and the family are heartbroken but will have no comments until the criminal process is concluded, but would like to thank the public, friends and family for their prayers and support."